i2pt

perform two-point ray tracing, i.e., determine the ray take- off angles that connect sources and observed receiver locations within each ray group; the receiver locations are obtained from the file tx.in for those picks that have the same integer code as specified in the array ivray for the ray group; if i2pt=2, only rays which reflect off the appropriate floating reflector specified in the array frbnd (if frbnd>0) are traced (default: 0)