I got these limits looking directly at the data files.

The table in the WD01 files goes from 1e-2 to 1e4 microns. Note that  this disagrees with the docstring, which states the range as being 1e-4 to 1e3 microns.

It seems I made a mistake for D03 though. The table there goes from 1e-4 to 1e4 microns (1 to 1e8 A).

Note that this disagrees with the docstring which states that the grid only goes up to 1e3 microns.