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continue to trace headwaves along a boundary even if the velocity contrast across the interface is no longer positive, in which case headwaves emerge parallel to the boundary (idiff=1); if idiff=2, initiate a headwave ray group even if there is no critical point (or it is not found) to model diffractions along the top of a low-velocity layer (default: 0)

Ingo Pecher
Sat Mar 7 19:13:54 EST 1998