ReadonlycolorOptional ReadonlydashOptional dash pattern — px on/off lengths ([6, 4] = 6 on, 4 off; [2, 3]
≈ dotted). Omit or [] for a solid stroke. This is the series' own style
— distinct from a GapMode's inferred faint gap-bridge dashing (that
marks missing data; this marks the whole line). Use it to set a modeled
series (a forecast / smoothed estimate, e.g. GARCH vol) apart from an
observed one at a glance.
Readonlywidth
A resolved line style: stroke colour + width (px).