PriceScaleMode: "linear" | "logarithmic" | "percentage" | "indexed-to-100"

Price-scale mode, each one a coordinate transform (see PriceScale._t): linear is the identity, logarithmic is log10, and percentage / indexed-to-100 rebase every price against a baseline: percent change from it, or the baseline rebased to 100. The rebasing pair needs a baseline from the data before it can transform anything, see PriceScale.setBaseline.

Overlay scales are supported in every mode: a series added with priceScaleId: '' gets a hidden scale with its own autoscale, see Pane._scaleFor.