Dumbbell · Coincident endpoints

A pair at zero retains both original endpoint values.

Use dumbbells for paired low and high values. The joining line connects supplied endpoints; it does not create a midpoint or a new measurement.

Named series contain stable id/x/low/high points. Values must be finite with low ≤ high, or both null. Coincident endpoints retain their exact values. Category, numeric and UTC-time X are supported.

Glyph endpoint radius is options.layout.markerRadius, 1–16 logical points, default 4. Configure shared/individual endpoint detail, axes, legend, labels, references and viewport. No stacking, line-marker controls or point overrides.

• Paired endpoints
• Compare pairs
• Coincident endpoints

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