1             0.                       :reference station number and x-coord.
100.          0.                       :station spacing and receiver depth
81    90    91   180       81. 0.        :shot 1 - r1 r2 r3 r4 s sdepth
82    91    92   181       82. 0.
83    92    93   182       83. 0.
84    93    94   183       84. 0.
85    94    95   184       85. 0.
86    95    96   185       86. 0.
87    96    97   186       87. 0.
88    97    98   187       88. 0.
89    98    99   188       89. 0.
90    99    100   189       90. 0.
91    100   101   190       91. 0.
92    101   102   191       92. 0.
93    102   103   192       93. 0.
94    103   104   193       94. 0.
95    104   105   194       95. 0.
96    105   106   195       96. 0.
97    106   107   196       97. 0.
98    107   108   197       98. 0.
99    108   109   198       99. 0.
100   109   110   199       100. 0.
