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when interpolating the boundaries and velocities using
izint, ivuint and ivlint, the corresponding switches equal to
0, 1 or -1 (see lines c, f and i in the description of the
file r.in for the program RAYINVR) will be set equal to 1 if
either of the switches across which the interpolation is
performed is equal to 1 and it will be set equal to -1 if the
two switches equal 0 and -1; if iswit=0, the corresponding
switch will be set equal to 0 if the switches across which
the interpolation is performed are different (default: 1)

*Ingo Pecher *

Sat Mar 7 19:13:54 EST 1998