The UF_ROUTE_bundle_data_s structure is the structure that is used
to pass information to and receive information from a user written
bundle diameter calculation routine. In Wiring, you may define
a "Plug-in" for the routine that calculates the set of curves that
should be used to model the cross section of the wire bundle based
on the number of wires in the bundle (and their diameters). This
is the structure that is supplied to your bundle diameter routine.

Please refer to the example