1             0.                       :reference station number and x-coord.
100.          0.                       :station spacing and receiver depth
61   70   71   160        61. 0.        :shot 1 - r1 r2 r3 r4 s sdepth
62   71   72   161        62. 0.
63   72   73   162        63. 0.
64   73   74   163        64. 0.
65   74   75   164        65. 0.
66   75   76   165        66. 0.
67   76   77   166        67. 0.
68   77   78   167        68. 0.
69   78   79   168        69. 0.
70   79   80   169        70. 0.
71   80   81   170        71. 0.
72   81   82   171        72. 0.
73   82   83   172        73. 0.
74   83   84   173        74. 0.
75   84   85   174        75. 0.
76   85   86   175        76. 0.
77   86   87   176        77. 0.
78   87   88   177        78. 0.
79   88   89   178        79. 0.
80   89   90   179        80. 0.
