OptionaldepthOptionalfromStart value in the x scale; resolved to the nearest index.
OptionalfromStart index (0-based, clamped to array bounds). Takes precedence over from.
OptionaltoEnd value in the x scale; resolved to the nearest index.
OptionaltoEnd index (0-based, clamped to array bounds). Takes precedence over to.
Number of levels of the binary tree. The returned vector has
2 ** depth - 1entries.