d3.stack() Constructs a new stack generator with the default settings.
radialArea.innerRadius([radius]) Equivalent to
d3.radialLine()
d3.symbol() Constructs a new symbol generator with the default settings.
radialLine.defined([defined]) Equivalent to
curve.lineStart() Indicates the start of a new line segment. Zero or more
d3.curveBundle(context)
d3.symbolCross The Greek cross symbol type, with arms of equal length.
d3.curveBasisClosed(context)
d3.stackOffsetExpand(series, order) Applies a zero baseline and normalizes the values for each point such that the topline
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