stack.keys([keys]) If keys is specified, sets the keys accessor to the specified function or array and returns
d3.arc() Constructs a new arc generator with the default settings.
d3.pie() Constructs a new pie generator with the default settings.
pie.value([value]) If value is specified, sets the value accessor to the specified function or number and returns
radialLine(data) Equivalent to line.
d3.symbolSquare The square symbol type.
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