iswit

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)