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- 'Correct Okabe-Ito #009E73 color with fully theme-adaptive chrome (backgrounds,
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text, grid, baseline) in both renders'
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- 'Complete spec compliance: correct title format, descriptive axis labels with
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units, all spec features present'
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- Clean KISS code structure, reproducible seed, correct output filenames
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weaknesses:
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- Could add units to axis labels (e.g., "Amplitude (a.u.)" for arbitrary units)
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- Does not leverage lets-plot interactive features like tooltips
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image_description: The plot displays a stem plot with 30 data points representing
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a damped oscillation signal. Blue vertical stems (#306998) extend from a black
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horizontal baseline at y=0 to blue circular markers at the top of each stem. The
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x-axis is labeled "Sample Index" (ranging 0-30), and the y-axis is labeled "Amplitude"
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(ranging approximately -0.7 to 1.1). The title "stem-basic · letsplot · pyplots.ai"
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is positioned at the top-left. The plot uses a clean minimal theme with light
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gray dashed grid lines. The data clearly shows the damped oscillation pattern
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- high amplitude oscillations at the start that progressively decay toward zero
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as the sample index increases.
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- Grid still uses dashed style rather than solid subtle lines with opacity RULE
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token — replace panel_grid linetype with solid and use RULE color token
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- 'LM-02 opportunity missed: letsplot''s interactive HTML output could configure
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tooltips showing sample index and amplitude value on hover'
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image_description: |-
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Light render (plot-light.png):
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Background: Warm off-white consistent with #FAF8F1 — correct, not pure white
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Chrome: Title "stem-basic · letsplot · anyplot.ai" in dark text (top-left), x-axis "Sample Index" and y-axis "Amplitude (a.u.)" labels in dark text, dark tick labels — all clearly readable
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Data: 30 teal-green stems (#009E73) as thin vertical lines from y=0 baseline to data points, with filled circular markers at tips; dark horizontal baseline at y=0; two dashed decay-envelope curves bracket the oscillation
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Legibility verdict: PASS
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Dark render (plot-dark.png):
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Background: Near-black consistent with #1A1A17 — correct dark theme
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Chrome: Title, axis labels, and tick labels appear in light near-white text — all clearly readable against dark background; no dark-on-dark text failures observed; baseline adapts to lighter tone; grid lines visible in lighter tone
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Data: Teal-green stems and markers identical in color to light render (#009E73) — only chrome flipped, data colors unchanged; envelope curves also identical in color
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Legibility verdict: PASS
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criteria_checklist:
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visual_quality:
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score: 36
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max: 40
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score: 28
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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: 10
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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 at proper
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sizes
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comment: Font sizes set (title 24, axis 20, tick 16); readable in both themes;
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slight concern about title size relative to 4800x2700 canvas
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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: 6
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max: 6
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passed: true
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comment: No overlapping text elements
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comment: Clean separation, no overlapping elements in either render
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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: Stems and markers are well-sized for the 30 data points, appropriate
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alpha
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comment: Stems and markers clearly visible; near-zero stems are very short
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but distinguishable
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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 blue color scheme is colorblind-safe
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comment: Single series, good contrast against both light and dark surfaces
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- id: VQ-05
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name: Layout Balance
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score: 5
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max: 5
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name: Layout & Canvas
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score: 4
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max: 4
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passed: true
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comment: Good proportions, plot fills canvas well with balanced margins
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comment: Good 16:9 proportions, plot fills canvas well, no cut-off elements
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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: false
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comment: Descriptive labels but no units ("Amplitude" could specify units)
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passed: true
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comment: Amplitude (a.u.) with units and Sample Index are descriptive
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- id: VQ-07
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name: Grid & Legend
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score: 1
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name: Palette Compliance
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score: 2
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max: 2
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passed: true
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comment: 'First series #009E73; light background ~#FAF8F1; dark background
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~#1A1A17; chrome is theme-adaptive in both renders'
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