... receiver¹

A ray is considered to be an eigenray if it arrives at the hydrophone in the interval [zeig-miss,zeig+miss]. Since eigenray search is a difficult task running the program with the 'EIG' requires the tracing of many rays, so instead of the 51 rays traced in the interval $\left[ -20\mbox{$^\circ$}\xspace ,20\mbox{$^\circ$}\xspace \right]$ the program traced 201 rays in the same interval.

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