ERROR BARS

dot with low-high interval per category. Needs: categories with a central value and a low-high range (spread, CI, min-max).

uncertaintycomparisonvariance

DL-01 AGRAW

Use when

estimates that carry a range: durations, forecasts, measurement spread
comparing both level AND uncertainty across categories

Do not use when

ranges are negligible (use CH-RNK-01)
full distribution shape matters (boxplot when built)

See instead

only the central value matters: CH-RNK-01

Alternatives

CH-DST-04 (full distribution shape, planned)

Rules

the interval is a capped line; the dot is the estimate
labels state value AND range
one highlight maximum
what the range means (CI, min-max, spread) is stated in title or source

Never do this

error bars without saying what they represent
bars with whiskers (length + interval double-encodes)
hiding uncertainty to look confident

QA before delivering

low <= value <= high on every row
range semantics stated
highlight <= 1
unit once
source present

Data shape

title	action title stating value and spread
eyebrow	caps, DL chrome only
source	bottom-left always; states what the range represents
unit	on the first label
categories	array of {label, value, low, high, highlight?}, low <= value <= high

Sample data (golden)

{
  "title": "MST loop tests run longest: 7 days typical, up to 11",
  "eyebrow": "TEST DURATIONS . SPREAD",
  "source": "Source: sample dataset v1 (min-max range), 2026-07-12",
  "unit": "days",
  "categories": [
    {
      "label": "MST",
      "value": 7,
      "low": 5,
      "high": 11,
      "highlight": true
    },
    {
      "label": "PS1",
      "value": 6,
      "low": 4,
      "high": 9
    },
    {
      "label": "PS5",
      "value": 6,
      "low": 4,
      "high": 9
    },
    {
      "label": "PS4",
      "value": 5,
      "low": 3,
      "high": 8
    }
  ]
}