1             0.                       :reference station number and x-coord.
100.          0.                       :station spacing and receiver depth
1   10  11  100       31.   0.         :shot 1 - r1 r2 r3 r4 s sdepth
31  40  41  130       81.   0.         :shot 2 - r1 r2 r3 r4 s sdepth
61  70  71  160      131.   0.         :shot 3 - r1 r2 r3 r4 s sdepth
