axisGroup property
Which axis this series scales against.
Only meaningful for overlay series (drawn on the main chart alongside
the candles): null (the default) shares the main price axis, same as
before. A non-null value scales this series on its own value range
instead — still painted layered over the candles, but excluded from the
shared candle/overlay min/max, so a small- or large-scale indicator
(e.g. a MACD-derived signal) doesn't distort the price axis. Overlay
series with the same non-null axisGroup share one combined scale
(e.g. a thick/thin pair of the same indicator family); different groups
are scaled and painted separately, so one indicator's range never
distorts another's (e.g. a 0-10-bounded indicator and a MACD-scale
indicator must use different groups). Ignored for non-overlay
(bottom-panel) series, which already have their own axis.
Implementation
final String? axisGroup;