d3.stackOrderNone(series) Returns the given series order [0, 1, … n - 1] where n is the number of elements

bundle.beta(beta) Returns a bundle curve with the specified beta in the range [0, 1], representing the bundle

line.curve([curve]) If curve is specified, sets the curve

stack.order([order]) If order is specified, sets the order accessor to the specified function or array and

symbol.size([size]) If size is specified, sets the size to the specified function or number and returns this

radialLine.context([context]) Equivalent to

radialLine.angle([angle]) Equivalent to line

d3.stackOffsetNone(series, order) Applies a zero baseline.

line.y([y]) If y is specified, sets the y accessor to the specified function or number and returns this line

d3.curveStepBefore(context)