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between light (#1A1A17) and dark (#F0EFE8); target nodes use INK_SOFT which also
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adapts; PAGE_BG backgrounds are correct (#FAF8F1 / #1A1A17)'
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- RGBA link colors (0.4 opacity) keyed to source node — flows are traceable while
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overlapping links remain distinguishable
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- 'Expert go.Sankey API usage: pad=25, thickness=35, line border color = PAGE_BG
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for clean separation, all parameters well-chosen'
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- Both PNG and HTML outputs generated; deterministic hardcoded data; KISS code structure
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throughout
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- 'Energy flow data is realistic and neutral: varied flow magnitudes across 4 sources
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and 4 targets, with selectively absent flows (Coal and Nuclear skip Transportation)
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adding plausibility'
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weaknesses:
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- 'Design Excellence is moderate (13/20): target nodes using INK_SOFT creates some
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visual distinction but the overall aesthetic is above-defaults rather than publication-ready;
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consider adding a subtle subtitle or unit annotation (TWh) to elevate storytelling'
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- 'DQ-03 minor deduction: coal-to-residential (5 TWh) and coal-to-commercial (8
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TWh) flows are somewhat high relative to modern energy realities where coal primarily
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feeds industrial and power-generation sectors; values are plausible but not factually
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tight'
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- 'DQ-01 minor deduction: all four sources have broadly similar distribution patterns
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(mostly Residential, Commercial, Industrial); introducing one source with a starkly
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different profile would increase feature coverage contrast'
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image_description: |-
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Light render (plot-light.png):
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Background: Warm off-white #FAF8F1 — correct, not pure white.
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Chrome: Title "Energy Distribution · sankey-basic · plotly · anyplot.ai" in dark #1A1A17 ink, 28px, clearly readable. Node labels (Natural Gas, Nuclear, Renewables, Coal on the left; Residential, Commercial, Transportation, Industrial on the right) rendered in #1A1A17 via global font=22px — all clearly legible against the warm background.
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Data: Four source nodes stacked on the left — Natural Gas (largest, orange #D55E00), Nuclear (blue #0072B2), Renewables (pink #CC79A7), Coal (green #009E73, bottom). Four target nodes on the right in dark gray (#4A4A44 INK_SOFT). Semi-transparent RGBA links (0.4 opacity) flow left-to-right, each colored after its source node. Natural Gas dominates as the widest band. Node border lines use PAGE_BG creating clean separation between stacked nodes.
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Legibility verdict: PASS — all text, including small node labels, clearly readable on the off-white surface.
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Dark render (plot-dark.png):
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Background: Near-black #1A1A17 — correct, not pure black.
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Chrome: Title in light cream #F0EFE8 — clearly readable against the dark background. Node labels also flip to #F0EFE8 via the global font color token (INK = #F0EFE8 in dark mode). No dark-on-dark text detected anywhere.
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Data: Source node colors are identical to the light render — Natural Gas orange, Nuclear blue, Renewables pink, Coal green — Okabe-Ito positions 1–4 unchanged. Target nodes flip to light gray (#B8B7B0 INK_SOFT dark), visible against dark background. Semi-transparent link bands are slightly more muted on the dark surface but remain distinguishable by source color. No data color has changed between themes — only chrome elements adapted.
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Legibility verdict: PASS — all text is light-on-dark with no dark-on-dark failures.
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criteria_checklist:
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visual_quality:
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score: 30
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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: 8
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max: 8
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passed: true
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comment: Title explicitly 28px, global font explicitly 22px covering all node
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labels; all text readable in both themes
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- id: VQ-02
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name: No Overlap
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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 or visual elements; node labels positioned cleanly
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inside/beside nodes
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- id: VQ-03
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name: Element Visibility
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score: 6
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max: 6
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passed: true
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comment: Nodes (thickness=35) and links clearly visible; semi-transparent
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links readable without obscuring each other
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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: Okabe-Ito palette is CVD-safe; 0.4 alpha on links provides adequate
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distinguishability
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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: Sankey fills canvas well with balanced margins (l:80, r:80, t:120,
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b:60); no wasted space
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- id: VQ-06
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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 title present; Sankey has no axes — node labels serve
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as data identifiers
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- id: VQ-07
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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: 'Coal=#009E73 first, then #D55E00, #0072B2, #CC79A7 in canonical
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order; backgrounds #FAF8F1/#1A1A17 correct'
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design_excellence:
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score: 13
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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: 5
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max: 8
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passed: true
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comment: 'Thoughtful: Okabe-Ito for sources, adaptive INK_SOFT for targets,
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PAGE_BG node borders for clean separation. Above defaults but not publication-ready'
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- id: DE-02
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name: Visual Refinement
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score: 4
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max: 6
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passed: true
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comment: pad=25 and thickness=35 are well-considered; clean layout with no
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extraneous elements; good refinement for Sankey type
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- id: DE-03
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name: Data Storytelling
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score: 4
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max: 6
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passed: true
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comment: Energy flow story readable through proportional node sizing — Natural
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Gas dominance clear; color coding enables flow tracing
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spec_compliance:
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score: 15
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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: 5
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max: 5
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passed: true
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comment: Correct Sankey diagram with nodes and proportional-width links
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- id: SC-02
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name: Required Features
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score: 4
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max: 4
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passed: true
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comment: Source→target flows, distinct colors per source category, link opacity,
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no circular flows, readable node labels
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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: Source and target indices correctly mapped; flow values drive link
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widths proportionally
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- id: SC-04
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name: Title & Legend
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score: 3
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max: 3
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passed: true
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comment: Title 'Energy Distribution · sankey-basic · plotly · anyplot.ai'
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includes spec-id, library, anyplot.ai in correct order
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