symbol.size([size]) If size is specified, sets the size to the specified function or number and returns this
d3.stackOrderNone(series) Returns the given series order [0, 1, … n - 1] where n is the number of elements
d3.curveStep(context)
d3.curveStepBefore(context)
curve.point(x, y) Indicates a new point in the current line segment with the given x- and y-values
line.curve([curve]) If curve is specified, sets the curve
line.y([y]) If y is specified, sets the y accessor to the specified function or number and returns this line
area(data) Generates an area for the given array of data. Depending on this area generator’s associated
area.curve([curve]) If curve is specified, sets the curve
curve.areaStart() Indicates the start of a new area segment. Each area segment consists of exactly two
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