CHART ENCODING — ORIGINAL EXAMPLES AND REVIEW SHEET
All data below are fictional demonstrations, not collected measurements.

WHITE SURFACE #FFFFFF; opaque sRGB ratios, exact threshold decisions before rounding.
alpha: #005A9C, contrast 7.13672595:1
beta: #9C5700, contrast 5.56017148:1
gamma: #8F327A, contrast 7.22842563:1
body: #182B36, contrast 14.60709869:1
axis: #47545F, contrast 7.77405550:1
grid: #667582, contrast 4.73846689:1

EXAMPLE 1 AND 6: PERIOD, ALPHA, BETA
P1: 3, 7
P2: 6, 4
P3: 5, 6
P4: 8, 3
Both scales 0 to 10. Alpha solid/circle; Beta dashed/square.

EXAMPLE 2: PERIOD, ALPHA LEFT STRIPES, BETA RIGHT DOTS
P1: 4, 6
P2: 7, 3
P3: 5, 8

EXAMPLE 3: Complete — check; Needs review — exclamation triangle; Not started — hollow square. Keep visible state names.

EXAMPLE 4: Low 2–3, Mid 4–6, High 7–9; these thresholds are only for the demonstration.
R1: 2 Low, 5 Mid, 8 High
R2: 7 High, 3 Low, 6 Mid
R3: 4 Mid, 9 High, 2 Low

EXAMPLE 5: {"Alpha": [[2, 3], [4, 5], [6, 4]], "Beta": [[2, 7], [5, 8], [8, 6]], "Gamma": [[3, 2], [7, 2], [9, 4]]}
Axes 0 to 10; circles Alpha, squares Beta, triangles Gamma.

REVIEW BEFORE PUBLISHING
1. Write the chart question and actual unit, period, source and uncertainty.
2. Give every important series a visible name and a second usable cue where needed.
3. Check ordinary text at 4.5:1 and required graphical parts at 3:1 against their actual adjacent colors.
4. Recalculate after changing surfaces, opacity, styling or states. Do not round a failing ratio into a pass.
5. Read without color; verify labels and patterns, but do not call grayscale a color-vision simulation.
6. Keep a complete, accessible text table or equivalent description.
7. Test the smallest displayed size, keyboard interactions and any hover-only values.
8. Keep axes and grouping consistent when comparing panels.
9. Verify source, dates, quantities and chart/table agreement.
10. Use a separate color-managed proof for print; grayscale is not a paper proof.