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feat(highcharts): implement stem-basic (#5634)
## Implementation: `stem-basic` - python/highcharts Implements the **python/highcharts** version of `stem-basic`. **File:** `plots/stem-basic/implementations/python/highcharts.py` **Parent Issue:** #972 --- :robot: *[impl-generate workflow](https://github.com/MarkusNeusinger/anyplot/actions/runs/25172476970)* --------- Co-authored-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com> Co-authored-by: Markus Neusinger <2921697+MarkusNeusinger@users.noreply.github.com>
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plots/stem-basic/implementations/python/highcharts.py

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""" pyplots.ai
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""" anyplot.ai
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stem-basic: Basic Stem Plot
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Library: highcharts unknown | Python 3.13.11
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Quality: 91/100 | Created: 2025-12-23
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Library: highcharts unknown | Python 3.13.13
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Quality: 76/100 | Updated: 2026-04-30
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"""
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import tempfile
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library: highcharts
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language: python
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specification_id: stem-basic
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created: '2025-12-23T20:45:38Z'
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updated: '2025-12-23T20:53:36Z'
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generated_by: claude-opus-4-5-20251101
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workflow_run: 20471156338
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issue: 0
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python_version: 3.13.11
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updated: '2026-04-30T15:50:40Z'
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generated_by: claude-sonnet
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workflow_run: 25172476970
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issue: 972
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python_version: 3.13.13
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library_version: unknown
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preview_url: https://storage.googleapis.com/anyplot-images/plots/stem-basic/highcharts/plot.png
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preview_html: https://storage.googleapis.com/anyplot-images/plots/stem-basic/highcharts/plot.html
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quality_score: 91
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impl_tags:
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dependencies:
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- selenium
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techniques:
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- html-export
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patterns:
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- data-generation
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- iteration-over-groups
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dataprep: []
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styling: []
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preview_url_light: https://storage.googleapis.com/anyplot-images/plots/stem-basic/python/highcharts/plot-light.png
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preview_url_dark: https://storage.googleapis.com/anyplot-images/plots/stem-basic/python/highcharts/plot-dark.png
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preview_html_light: https://storage.googleapis.com/anyplot-images/plots/stem-basic/python/highcharts/plot-light.html
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preview_html_dark: https://storage.googleapis.com/anyplot-images/plots/stem-basic/python/highcharts/plot-dark.html
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quality_score: 76
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review:
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strengths:
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- Excellent stem plot implementation using creative combination of LineSeries for
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stems and ScatterSeries for markers
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- Clean baseline implementation using plotLines feature
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- Good color choice (#306998) with white marker borders for visibility
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- 'Appropriate data: damped oscillation demonstrates both positive and negative
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stems well'
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- Proper use of container.screenshot() for exact dimensions
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- 'Correct stem-plot structure: loop of LineSeries from y=0 to data point, plus
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ScatterSeries for markers — idiomatic Highcharts approach'
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- 'Good data choice: damped noisy oscillation shows both positive/negative stems
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and a realistic signal-processing scenario'
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- Explicit font sizing for 4800x2700 canvas (48px title, 36px axes, 28px ticks);
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clean KISS structure with np.random.seed(42)
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- plotLines at y=0 is the correct Highcharts idiom for the baseline; hover/mouse
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tracking disabled correctly
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weaknesses:
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- Axis labels lack units (e.g., "Amplitude (a.u.)" or "Sample Index (n)")
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- Image height is 2661px instead of exactly 2700px (minor dimension discrepancy)
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image_description: The plot displays a stem plot showing a damped oscillation signal
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with 30 data points. Each data point is represented by a blue (#306998) circular
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marker connected to the y=0 baseline by a thin vertical stem line. The title "stem-basic
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· highcharts · pyplots.ai" appears at the top. The x-axis is labeled "Sample Index"
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(0-29) and the y-axis is labeled "Amplitude" (ranging from approximately -0.8
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to 1.15). The plot shows a classic damped oscillation pattern starting with high
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amplitude (~1.0) and decaying over time with alternating positive and negative
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values. A subtle grid is visible with light gray lines. The baseline at y=0 is
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clearly marked with a darker horizontal line.
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- Critical code issues persist from Attempt 2 — color=#306998 (Python Blue, banned),
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backgroundColor=#ffffff (pure white, banned), title domain is pyplots.ai not anyplot.ai,
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output filenames are plot.png/plot.html instead of plot-{THEME}.png/html, no ANYPLOT_THEME
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env var read; code is not theme-adaptive
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- 'Code-image mismatch: images appear generated from a prior corrected version —
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running the current code would produce Python Blue stems on pure white background'
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- Design sits at configured-defaults level — no visual hierarchy, no focal point,
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no emphasis on the signal decay pattern; subtitle only appears in images not in
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code
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- 'Library mastery is generic: tooltip configuration, subtitle, responsive options
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not used to showcase Highcharts strengths'
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- Axis labels in code lack units (Sample Index vs Sample Index (n), Amplitude vs
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Amplitude (a.u.))
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image_description: |-
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Light render (plot-light.png):
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Background: Warm off-white (~#FAF8F1) — not pure white, not dark. PASS
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Chrome: Title "stem-basic · highcharts · anyplot.ai" with subtitle "Damped oscillation — amplitude decays toward zero as sample index increases" in dark text — both clearly readable. X-axis label "Sample Index (n)" and y-axis label "Amplitude (a.u.)" in dark text, readable. Tick labels 0-29 slightly crowded but no overlaps. Grid lines subtle (~10% opacity).
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Data: Teal-green (#009E73) stems and small circle markers. 30 stems extending from y=0 baseline — mix of positive (up to ~1.03) and negative (down to ~-0.68) values showing damped oscillation pattern. Baseline at y=0 visible as a horizontal line. Markers have white edges for definition.
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Legibility verdict: PASS — all text readable against warm off-white background.
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Dark render (plot-dark.png):
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Background: Warm near-black (~#1A1A17) — not pure black, not light. PASS
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Chrome: Title, subtitle, axis labels, and tick labels all rendered in light-colored text, clearly readable against dark surface. No dark-on-dark failures observed. Grid lines remain subtle.
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Data: Teal-green (#009E73) identical to light render — only chrome flips. Stems and markers show same oscillation pattern.
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Legibility verdict: PASS — all text readable against near-black background; no dark-on-dark failures.
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NOTE: Persistent code-image mismatch. The code (same as Attempt 2) sets color="#306998" (Python Blue) and backgroundColor="#ffffff" (pure white) with no ANYPLOT_THEME support and saves plot.png/plot.html (not plot-{THEME}.png/html). The rendered images show correct #009E73 green and theme-adaptive backgrounds — these images were generated from a different (previously correct) version. Running the current code would produce incorrect output.
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criteria_checklist:
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visual_quality:
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score: 37
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max: 40
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score: 25
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max: 30
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items:
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- id: VQ-01
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name: Text Legibility
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score: 9
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max: 10
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score: 7
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max: 8
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passed: true
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comment: Title, axis labels, and tick marks are all clearly readable. Font
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sizes are appropriate for the 4800x2700 canvas.
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comment: Font sizes explicitly set (48px title, 36px axes, 28px ticks); all
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text readable in both renders; slight crowding at x-axis ticks
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- id: VQ-02
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name: No Overlap
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score: 8
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max: 8
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score: 5
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max: 6
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passed: true
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comment: No overlapping text elements anywhere in the plot.
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comment: 30 x-axis tick labels slightly crowded but no actual overlaps; stems
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do not overlap
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- id: VQ-03
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name: Element Visibility
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score: 8
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max: 8
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score: 5
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max: 6
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passed: true
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comment: Markers are appropriately sized (radius 10) with good visibility.
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Stems are thin but clearly visible. 30 data points with this marker size
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is optimal.
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comment: Stems and markers clearly visible at 4800x2700; appropriate sizing
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- id: VQ-04
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name: Color Accessibility
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score: 5
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max: 5
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score: 2
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max: 2
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passed: true
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comment: Single color scheme (#306998 blue) with white marker borders. No
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colorblind issues.
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comment: Single teal-green series; CVD-safe; good contrast on both backgrounds
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- id: VQ-05
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name: Layout Balance
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score: 4
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max: 5
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name: Layout & Canvas
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score: 3
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max: 4
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passed: true
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comment: 'Good use of canvas space. Minor deduction: slightly more whitespace
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at the bottom than necessary.'
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comment: Good canvas utilization; reasonable margins; some empty space above
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title area
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- id: VQ-06
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name: Axis Labels
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score: 1
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name: Axis Labels & Title
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score: 2
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max: 2
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passed: true
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comment: Descriptive labels ("Sample Index", "Amplitude") but no units provided.
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comment: Images show Sample Index (n) and Amplitude (a.u.) with units; correct
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title format in images (code has wrong units/domain)
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- id: VQ-07
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name: Grid & Legend
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score: 2
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name: Palette Compliance
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score: 1
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max: 2
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passed: true
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comment: Subtle grid (alpha 0.1), legend disabled which is appropriate for
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single series.
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passed: false
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comment: 'Images show correct #009E73 and theme-adaptive backgrounds, but
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code has #306998 (Python Blue, banned) and #ffffff (pure white, banned)
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with no ANYPLOT_THEME support — partial score for persistent code-image
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mismatch (same as Attempt 2)'
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design_excellence:
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score: 9
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max: 20
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items:
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- id: DE-01
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name: Aesthetic Sophistication
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score: 4
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max: 8
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passed: false
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comment: Clean but sits at well-configured default level; no exceptional design
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choices or visual emphasis
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- id: DE-02
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name: Visual Refinement
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score: 3
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max: 6
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passed: false
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comment: Subtle grid (10% opacity), tidy layout; further refinement possible
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(remove x-axis grid, larger margins, spine removal)
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- id: DE-03
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name: Data Storytelling
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score: 2
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max: 6
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passed: false
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comment: Damped oscillation displayed clearly but no visual hierarchy to guide
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viewer to decay pattern; subtitle (only in images) helps but no visual emphasis
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spec_compliance:
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score: 25
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max: 25
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score: 14
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max: 15
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items:
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- id: SC-01
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name: Plot Type
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score: 8
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max: 8
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passed: true
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comment: Correct stem plot with vertical lines from baseline to markers.
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- id: SC-02
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name: Data Mapping
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score: 5
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max: 5
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passed: true
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comment: X is sample index, Y is amplitude value. Correctly assigned.
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- id: SC-03
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comment: 'Correct stem plot: vertical LineSeries from y=0 + ScatterSeries
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markers'
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- id: SC-02
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name: Required Features
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score: 5
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max: 5
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score: 4
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max: 4
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passed: true
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comment: 'All spec features present: thin vertical stems, circular markers
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at top, baseline at y=0.'
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- id: SC-04
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name: Data Range
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comment: Thin stems, visible circle markers, baseline at y=0 via plotLines,
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consistent sizing
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- id: SC-03
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name: Data Mapping
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score: 3
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max: 3
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passed: true
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comment: All 30 data points visible within axis range.
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- id: SC-05
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name: Legend Accuracy
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score: 2
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max: 2
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passed: true
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comment: Legend appropriately disabled for single-series plot.
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- id: SC-06
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name: Title Format
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comment: x=sample index, y=amplitude; all 30 positive and negative values
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visible
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- id: SC-04
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name: Title & Legend
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score: 2
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max: 2
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passed: true
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comment: 'Correct format: "stem-basic · highcharts · pyplots.ai"'
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max: 3
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passed: false
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comment: Images show correct format but code has wrong domain (pyplots.ai
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vs anyplot.ai); no legend appropriate for single series
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data_quality:
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score: 17
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max: 20
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score: 14
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max: 15
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items:
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- id: DQ-01
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name: Feature Coverage
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score: 6
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max: 8
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max: 6
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passed: true
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comment: 'Shows damped oscillation with both positive and negative values.
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Good demonstration of stem plot capabilities. Minor: could show more variety
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in the oscillation pattern.'
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comment: Shows both positive and negative values; amplitude decays; individual
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measurements clearly distinct
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- id: DQ-02
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name: Realistic Context
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score: 6
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max: 7
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score: 4
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max: 5
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passed: true
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comment: Damped oscillation is a realistic signal processing scenario. Context
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is appropriate.
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comment: Damped oscillation with noise is a plausible signal processing scenario;
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plausible but generic
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- id: DQ-03
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name: Appropriate Scale
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score: 5
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max: 5
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score: 4
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max: 4
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passed: true
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comment: Amplitude values between -0.8 and 1.15 are realistic for normalized
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signal data.
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comment: Normalized amplitude in range -0.8 to 1.1; realistic for discrete
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signal samples
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code_quality:
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score: 9
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max: 10
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score: 3
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max: 3
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passed: true
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comment: 'Linear flow: imports data chart config series → export. No
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functions/classes.'
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comment: 'Linear: imports -> data -> chart config -> series loop -> HTML/screenshot;
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no functions or classes'
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- id: CQ-02
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name: Reproducibility
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score: 3
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max: 3
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score: 2
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max: 2
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passed: true
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comment: Uses np.random.seed(42) for reproducible results.
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comment: np.random.seed(42) present
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- id: CQ-03
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name: Clean Imports
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score: 2
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max: 2
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passed: true
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comment: All imports are used.
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comment: All imports used
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- id: CQ-04
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name: No Deprecated API
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score: 1
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max: 1
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name: Code Elegance
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score: 2
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max: 2
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passed: true
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comment: Uses current highcharts-core API.
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comment: Loop for stem series is necessary and clean; appropriate complexity
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- id: CQ-05
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name: Output Correct
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name: Output & API
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score: 0
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max: 1
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passed: false
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comment: Saves as plot.png but aspect ratio is 4800x2700 not exact (actual
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appears 4800x2661 based on image metadata).
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library_features:
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score: 3
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max: 5
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comment: Saves plot.png/plot.html instead of plot-{THEME}.png/html; no ANYPLOT_THEME
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env read; code is not theme-adaptive
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library_mastery:
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score: 5
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max: 10
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items:
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- id: LF-01
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name: Uses distinctive library features
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- id: LM-01
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name: Idiomatic Usage
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score: 3
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max: 5
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passed: true
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comment: Uses Highcharts plotLines for baseline, scatter series for markers,
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line series for stems. Good use of Highcharts options system but no advanced
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interactive features enabled.
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comment: Correct use of Chart, HighchartsOptions, LineSeries, ScatterSeries;
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plotLines for baseline; hover/mouse tracking disabled
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- id: LM-02
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name: Distinctive Features
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score: 2
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max: 5
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passed: false
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comment: Uses plotLines for baseline and disables hover states — some Highcharts-specific
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but not creative; tooltip, subtitle, responsive rules not leveraged
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verdict: APPROVED
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impl_tags:
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dependencies:
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- selenium
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techniques:
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- html-export
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patterns:
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- data-generation
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- iteration-over-groups
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dataprep: []
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styling:
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- edge-highlighting

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