VIOLIN

mirrored density silhouette per category with a median tick. Needs: categories with a DECLARED density curve (grid + densities) and median.

distribution

DL-01 AGRAW

Use when

statistical audiences comparing multimodal shapes that a box hides
the density curve is already computed and declared, with its bandwidth

Do not use when

general audiences (violins are widely misread: prefer CH-DST-04 or
CH-DST-03)
small samples (a violin smooths noise into false shape)

See instead

the audience is not statistical: CH-DST-04
few enough values to show raw: CH-DST-03

Alternatives

CH-DST-04 (quartile summary)
CH-DST-03 (raw values)
CH-DST-09 (one unmirrored curve)

Rules

densities are supplied, never computed silently; the source line
states the bandwidth
global normalization: silhouette heights comparable across rows
median tick spans the silhouette at its position
shared zero-based value scale

Never do this

violins for general audiences
silent KDE with hidden bandwidth
per-row normalization sold as comparable
fewer than ~30 underlying values

QA before delivering

densities declared with bandwidth in the source
medians in range
global normalization
unit once
source present

Data shape

title	action title with a number
source	bottom-left always, must state the density bandwidth
unit	on first median label
categories	array of {label, grid: ascending values, density, median}
note	densities are DECLARED inputs; OVP never runs a silent KDE

Sample data (golden)

{
  "title": "Gate B hides two clusters behind one median",
  "eyebrow": "REVIEW TIME SHAPES",
  "source": "Source: document register, H1; KDE bandwidth 2.5 days",
  "unit": "days",
  "categories": [
    {
      "label": "Gate A",
      "grid": [
        0,
        5,
        10,
        15,
        20,
        25,
        30,
        35,
        40
      ],
      "density": [
        1,
        3,
        8,
        14,
        9,
        4,
        2,
        1,
        0
      ],
      "median": 15
    },
    {
      "label": "Gate B",
      "grid": [
        0,
        5,
        10,
        15,
        20,
        25,
        30,
        35,
        40
      ],
      "density": [
        6,
        10,
        4,
        2,
        3,
        5,
        9,
        6,
        1
      ],
      "median": 15
    },
    {
      "label": "Gate C",
      "grid": [
        0,
        5,
        10,
        15,
        20,
        25,
        30,
        35,
        40
      ],
      "density": [
        2,
        4,
        6,
        8,
        8,
        8,
        6,
        4,
        2
      ],
      "median": 20
    }
  ]
}