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this PR

This doesn't lead to incorrect results, but it does erroneously flag some radii
as being illegal when they aren't (making it impossible to run some suggested
systems).

The parameters need to be compared to the table limits *before* subtracting off
the offset, whereas it's currently being done after.

See https://simtk.org/forums/viewtopic.php?f=161&t=6512&p=16820#p16820 for more
information