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- Correct ECDF implementation with step=left creating proper vertical jumps at each
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data point
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- Excellent text legibility with appropriately scaled fonts for 4800x2700 resolution
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- Clean, professional appearance with subtle dashed grid lines
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- Proper Y-axis range from 0 to 1 as required for cumulative proportion
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- Both PNG and HTML outputs generated for static and interactive viewing
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- Follows library-specific guidelines for Selenium-based PNG export
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- 'Perfect spec compliance: correct ECDF step function with Y-axis 0-1, grid lines,
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and distinct line style (15/15).'
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- 'Excellent data quality: real-world API response time scenario with 220 samples
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and realistic 0-620ms range (15/15).'
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- 'Correct theme adaptation: both renders have proper backgrounds (#FAF8F1 / #1A1A17),
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adaptive chrome, and identical #009E73 data color across themes.'
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- 'Informative subtitle adds context: Empirical cumulative distribution across 220
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sampled requests.'
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- 'Correct output artifacts: themed PNG and HTML files generated for both light
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and dark modes.'
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weaknesses:
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- Legend positioned at bottom center could be repositioned to avoid overlap with
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x-axis label
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- Axis labels lack units (e.g., Value (units) would be more descriptive)
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- Data uses a simple normal distribution; a slightly more interesting distribution
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would better demonstrate ECDF capabilities
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image_description: The plot displays an ECDF (Empirical Cumulative Distribution
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Function) step chart on a white background. The title "ecdf-basic · highcharts
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· pyplots.ai" is prominently displayed at the top in bold black text. The X-axis
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is labeled "Value" and ranges from approximately 10 to 86, representing the sample
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values from a normal distribution. The Y-axis is labeled "Cumulative Proportion"
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and correctly ranges from 0 to 1. The ECDF is rendered as a blue (#306998 Python
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Blue) step function line that rises from left to right in a characteristic S-curve
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shape typical of normally distributed data. Dashed gray grid lines are present
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on both axes to aid in reading values. A legend showing "ECDF" appears at the
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bottom center. The chart uses the step="left" configuration, creating proper vertical
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jumps at each data point.
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- 'All four spines form a box frame — style guide requires removing top and right
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spines (L-shaped frame). Set lineWidth: 0 or lineColor: transparent on the top/right
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axis equivalents.'
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- No percentile reference lines (p50, p90, p95) or annotations — add Highcharts
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plotLines on the Y-axis with labels showing both percentile name and x-intercept
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value (e.g., p90 = 312 ms).
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- Top margin is slightly tight — Y-axis tick label 1 crowds the top border; increase
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spacingTop or marginTop in chart options.
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image_description: |-
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Light render (plot-light.png):
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Background: Warm off-white approximately #FAF8F1 — correct light theme surface, not pure white.
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Chrome: Title "API Response Times · ecdf-basic · highcharts · anyplot.ai" bold dark text clearly readable. Subtitle "Empirical cumulative distribution across 220 sampled requests" in smaller dark text, readable. X-axis label "Response Time (ms)" and Y-axis label "Cumulative Proportion" both in dark text with units. Tick labels (0, 0.2, 0.4, 0.6, 0.8, 1 on Y; 0-600 on X) are visible; the "1" tick at the top Y-axis edge is slightly crowded against the top border. Subtle horizontal grid lines visible. Full box frame (all 4 spines).
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Data: ECDF step function in #009E73 brand green. Step function rises steeply through 0-200ms (most API responses) then plateaus toward 1.0 for the remaining tail up to ~620ms.
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Legibility verdict: PASS — all text is dark on light background with no light-on-light failures.
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Dark render (plot-dark.png):
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Background: Near-black approximately #1A1A17 — correct dark theme surface, not pure black.
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Chrome: Title, subtitle, axis labels, and tick labels all flip to light/near-white text, clearly readable against the dark surface. Grid lines are subtle lighter lines visible on dark background. No dark-on-dark failures detected anywhere.
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Data: ECDF step function in #009E73 brand green — identical color to the light render. Data colors unchanged between themes as required.
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Legibility verdict: PASS — all text is light on dark background with no dark-on-dark failures.
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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 at 72px, axis labels at 48px, tick labels at 36px - all perfectly
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readable at 4800x2700
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comment: Title, subtitle, axis labels, tick labels all explicitly sized and
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readable in both themes; slight deduction for y=1 tick crowding top border
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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: No overlapping text or chart elements
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- id: VQ-03
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name: Element Visibility
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score: 7
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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: Line width of 6px is good for the step function, markers disabled
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as appropriate for ECDF
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comment: ECDF step line perfectly visible and appropriately weighted in both
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renders
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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 (#306998) with good contrast against white background
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comment: 'Single series in #009E73 (Okabe-Ito position 1), CVD-safe with strong
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contrast'
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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 proportions, adequate margins; plot fills canvas well but legend
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position at bottom center is slightly awkward
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comment: Good canvas utilization; minor deduction for y=1 tick crowding top
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border (tight top margin)
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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: '"Value" and "Cumulative Proportion" are descriptive but lack units'
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comment: Response Time (ms) includes units; Cumulative Proportion is 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: Grid is subtle with dashed style and 0.15 alpha, but legend placement
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at bottom overlaps slightly with x-axis label area
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comment: 'First series is #009E73; light background warm off-white; dark background
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