Line Charts
A line with no callouts—what is recorded at each tick?
✅ NormativeSettled. The requirement holds as written.📄 Page ruleCan be applied from the page alone.Read §11.2.5 in the RFC ↗
A line chart MUST be rendered with one value per series per x position: one row per x position, one column per series, each series named by its legend entry or by its direct label at the line's end. A value printed at a point MUST be copied; every other value is read against the axis. Wiggles between x positions are not positions.
When it applies
- A line labeled directly at its end is a named series: the printed name at the line's end heads its column (see Labels (§11.1.2)).
- An x position the axis does not label is labeled by its axis value (see Cover Every Data Point (§11.1.1)).
- A labeled trend, average or reference line adds no column (see Multiple Charts and Reference Ink (§11.1.3)).
- Scenario lines that share one drawn curve early on have identical values in those positions — correct, not a copying slip.
Reading the examples. Each one pairs a source page with the output the rule expects. ✅ Sample: the rule applies. ❌ Counter-sample: it looks like it applies and does not, or a rendering got it wrong. A non-conforming output, in red, is shown only for contrast. … marks content left out of an excerpt.
Examples
Five lines named by their direct labels over eleven labeled yearshealth-workforce-2024_p45
Five lines named by their direct labels over eleven labeled years, nothing printed on the lines:
5 × 11 = 55 values, each the line's centre at the year read against the 5-unit grid (tolerance
0.05 where the vertex sits near a gridline, 0.1 where it does not). Columns follow the direct
labels from top to bottom. The value-axis title follows the table. The axis also prints a stray .
after 2022, at a position with no line; it is not given a row.
Source page
Expected output
| Italy | Belgium | France | Slovak Republic | Germany | |
|---|---|---|---|---|---|
| 2012 | 7 | 14 | 11 | 8 | 4 |
| 2013 | 8 | 14.7 | 12.3 | 8.9 | 4.1 |
| 2014 | 9.4 | 15.5 | 13.3 | 9.6 | 4.5 |
| 2015 | 10.7 | 16.3 | 14.3 | 10.4 | 5.1 |
| 2016 | 13 | 17.6 | 15.2 | 11.5 | 5.6 |
| 2017 | 15.4 | 18.1 | 15.9 | 12.7 | 6 |
| 2018 | 18 | 18.8 | 16.6 | 14.2 | 6.4 |
| 2019 | 20.8 | 19.5 | 17.3 | 15.5 | 6.8 |
| 2020 | 23 | 20 | 17.9 | 16.3 | 7.1 |
| 2021 | 25 | 20.5 | 18.5 | 16.7 | 7.5 |
| 2022 | 27 | 21 | 19 | 17 | 8 |
Share of physicians aged 65 and over
Three scenario lines named and valued by their end labels (Highenergy-outlook-2025_p20
11 Tcf, +150% …). The name part
heads each column; the rest of the label, printed at the 2040 end of the line, is that line's 2040
value, copied whole — the Low label's second line (from 2024 levels) included. The Low line
ends near 8.5 on the axis, but its printed 8 Tcf wins. Every other value is an estimate on the
2-unit grid; the shared early curve gives all three series the same values in 2024 and 2026, and
Mid and Low the same values in 2028 and 2030. The rows are the 9 printed ticks (2024–2040, every
second year): 3 × 9 = 27 values.
Source page
Expected output
Trillion cubic feet
| High | Mid | Low | |
|---|---|---|---|
| 2024 | 4.4 | 4.4 | 4.4 |
| 2026 | 5.4 | 5.4 | 5.4 |
| 2028 | 8.0 | 6.6 | 6.6 |
| 2030 | 10.3 | 8.0 | 8.0 |
| 2032 | 10.8 | 9.0 | 8.2 |
| 2034 | 10.9 | 9.7 | 8.0 |
| 2036 | 11.0 | 9.9 | 8.0 |
| 2038 | 10.9 | 10.0 | 8.4 |
| 2040 | 11 Tcf, +150% | 10 Tcf, +129% | 8 Tcf, +94% from 2024 levels |
Source: Caldrivane Energy Research Note: The high, mid, and low ranges reflect uncertainty around future fossil fuel prices, economic growth, clean energy technology costs, and trade policy.
Neighbouring rules, and how they differ
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Rule id charts-line-charts · charts types