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- Realistic, neutral dataset (marathon finish times by runner age group) with a
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clear, plausible upward trend across categories that gives the chart a storytelling
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angle
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clear, plausible upward trend across categories
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weaknesses:
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- Strip points heavily overlap into near-solid green blobs inside the boxes for
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the denser groups (50-59, 60+, ~34-45 points each) — increase jitter width slightly
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(e.g. 0.35-0.4 span) and/or drop symbolSize from 9 to ~6-7 to keep individual
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points distinguishable per the spec's 'points use jitter and transparency to reduce
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overlap' requirement
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- Design is monochromatic single-color across all five box/strip groups with no
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additional visual hierarchy or annotation calling out the age-related trend —
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consider a subtle callout or emphasis on the clearest group-to-group increase
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to strengthen data storytelling (DE-03)
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- Distinctive echarts-specific features are minimal beyond the basic boxplot+scatter
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composition mandated by the spec itself — combining a library-specific touch (e.g.
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markLine for an overall mean/median reference) would raise library mastery
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- The new markLine label ("Median +55 min...") is positioned at the midpoint of
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the trend line, which lands directly on top of the 40-49 group's box outline and
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its densest cluster of strip points — the dashed line and text visually collide
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with data marks instead of sitting in clear space
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- 50-59 and 60+ groups still show noticeably denser point overlap than the younger
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groups (larger sample sizes, 45 and 34 points) — individual points are now distinguishable
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but still touch/overlap frequently
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- Design remains monochromatic (single green hue across all elements) with limited
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additional visual polish beyond the new trend line
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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 — not pure white, not dark.
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Chrome: Title "cat-box-strip · javascript · echarts · anyplot.ai" centered at top in dark ink, clearly legible. Legend ("Distribution", "Runners") below title in soft ink, readable. X-axis "Runner Age Group" (20-29, 30-39, 40-49, 50-59, 60+) and Y-axis "Finish Time (minutes)" (150-390) both fully legible with dark tick labels against the light background. Horizontal gridlines are thin and subtle, visible but not dominant.
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Data: Box plots outlined in Imprint green (#009E73) with transparent fill, showing median line, Q1/Q3 box, and whisker caps for each of the five age groups. Individual runner points (green, opacity 0.4) are jittered around each category's x-position, overlaid on the boxes. First/only data series correctly uses #009E73.
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Legibility verdict: PASS
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Background: Warm off-white (~#FAF8F1), not pure white.
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Chrome: Title "cat-box-strip · javascript · echarts · anyplot.ai" centered in dark ink, fully legible. Legend ("Distribution", "Runners") sits directly below the title. Axis titles ("Runner Age Group", "Finish Time (minutes)") and all tick labels render in dark/soft-ink and are clearly readable. Horizontal gridlines are thin and subtle.
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Data: Five box plots (transparent fill, #009E73 outline) show median/Q1/Q3/whiskers per age group, with jittered green strip points (opacity 0.4, symbolSize 7) overlaid — individual points are distinguishable, though the 50-59 and 60+ groups still show frequent overlap given larger sample sizes. A new dashed markLine trend annotation runs from the 20-29 median to the 60+ median, labeled "Median +55 min (20-29 → 60+)" — the label sits directly on top of the 40-49 box and its dense point cluster, creating visual overlap with data marks (text remains legible, but the placement is cluttered).
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Legibility verdict: PASS (all text readable; overlap is a data/annotation collision, not a legibility failure)
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Dark render (plot-dark.png):
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Background: Warm near-black, consistent with #1A1A17 — not pure black, not light.
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Chrome: Title, legend, and both axis titles/tick labels render in light ink tones, clearly legible against the dark background. No dark-on-dark text observed anywhere (title, axis names, tick labels, legend all pass). Gridlines are faint but visible.
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Data: Box outlines and jittered strip points use the identical Imprint green (#009E73) as the light render — only the chrome (background, text, grid) flipped, confirming theme-adaptive tokens were threaded correctly through the whole option object.
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Legibility verdict: PASS
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Background: Warm near-black (~#1A1A17), not pure black.
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Chrome: Title, legend, and both axis titles/tick labels render in light ink and are clearly legible — no dark-on-dark failures. Gridlines faint but present.
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Data: Box outlines and jittered strip points use the identical #009E73 green as the light render — only chrome (background, text, grid, markLine color) flipped between themes, as required. The same markLine label overlap with the 40-49 box/points is present here too.
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Legibility verdict: PASS (all text readable; same overlap issue as light render, not a legibility failure)
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criteria_checklist:
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visual_quality:
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score: 27
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score: 26
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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: 7
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max: 8
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passed: true
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comment: All text readable in both themes; font sizes explicitly set via tokens
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comment: All text readable in both themes; markLine label crosses over box/points
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but stays legible
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- id: VQ-02
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name: No Overlap
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score: 6
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score: 4
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max: 6
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passed: true
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comment: No text collisions with other text or data
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comment: markLine trend label + dashed line overlaps the 40-49 box outline
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and its densest strip points
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- id: VQ-03
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name: Element Visibility
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score: 4
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score: 5
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max: 6
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passed: true
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comment: Dense groups (50-59, 60+) show heavy point overlap into near-solid
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blobs — jitter/marker size could be tuned further
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comment: Wider jitter + smaller markers improved point distinguishability;
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50-59/60+ still moderately dense
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- id: VQ-04
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name: Color Accessibility
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score: 2
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max: 2
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passed: true
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comment: High contrast, monochromatic green, no red-green reliance
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comment: Single-hue green, no red-green reliance
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- id: VQ-05
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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: Canvas gate passed (3200x1800), no overflow, good proportions
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