request.header(name[, value]) If value is specified, sets the request header with the specified name to the specified value and returns this request instance. If value is null, removes the request header with the specified name instead. If value is not specified, returns the current value of the request header with the specified name. Header names are case-insensitive. Request headers can only be modified before the request is sent. Therefore, you cannot pass a callback to the request constr

request.get([data][, callback]) Equivalent to request.send with the GET method: request.send("GET", data, callback);

request.abort() Aborts this request, if it is currently in-flight, and returns this request instance. See XMLHttpRequest’s abort.

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

radialLine.radius([radius]) Equivalent to line.y, except the accessor returns the radius: the distance from the origin ⟨0,0⟩.

radialLine.defined([defined]) Equivalent to line.defined.

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

radialLine.context([context]) Equivalent to line.context.

radialLine.angle([angle]) Equivalent to line.x, except the accessor returns the angle in radians, with 0 at -y (12 o’clock).

radialLine(data) Equivalent to line.