d3.geoPolyhedralCollignon() The Collignon butterfly projection.

lagrange.spacing([spacing]) Defaults to 0.5.

rectangularPolyconic.parallel([parallel]) Defaults to 0°.

d3.timeSecond d3.utcSecond Seconds (e.g., 01:23:45.0000 AM); 1,000 milliseconds.

d3.curveCatmullRomClosed(context) Produces a closed cubic Catmull–Rom spline using the specified control points and the parameter alpha, which defaults to 0.5, as proposed by Yuksel et al. When a line segment ends, the first three control points are repeated, producing a closed loop.

d3.timeMinute d3.utcMinute Minutes (e.g., 01:02:00 AM); 60 seconds. Note that ECMAScript ignores leap seconds.

d3.merge(arrays) Merges the specified arrays into a single array. This method is similar to the built-in array concat method; the only difference is that it is more convenient when you have an array of arrays. d3.merge([[1], [2, 3]]); // returns [1, 2, 3]

d3.stackOffsetExpand(series, order) Applies a zero baseline and normalizes the values for each point such that the topline is always one.

radialArea.curve([curve]) Equivalent to area.curve. Note that curveMonotoneX or curveMonotoneY are not recommended for radial areas because they assume that the data is monotonic in x or y, which is typically untrue of radial areas.

line.defined([defined]) If defined is specified, sets the defined accessor to the specified function or boolean and returns this line generator. If defined is not specified, returns the current defined accessor, which defaults to: function defined() { return true; } The default accessor thus assumes that the input data is always defined. When a line is generated, the defined accessor will be invoked for each element in the input data array, being passed the element d, the index i, and the