model                                   : model file
4                                       : # interfaces
5000. 6000. 7000.
8000. 9000.                             : velocities
PTRACES                                 : modified time data
0                                       : # traces to skip
200                                     : # traces
0.004                                   : sample rate
1001                                    : points/trace
50.                                     : max frequency
500                                     : shot position
1000.                                   : x-coordinate of 1st receiver
40.                                     : receiver spacing
reflect                                 : reflectivity
reflectcos                              : reflectivity * cos(theta)
000.         0.                         : x-z coords of first output pt.
50.                                     : output trace spacing
30.                                     : output spacing of points
301                                     : # points per output trace
2                                       : # patterns
1        1      100                     : first trace range in pattern 1 
5        2       5                      : skip parameters for pattern 1
100      1      150                     : last trace range in pattern 1
2        1       2                      : skip parameters for pattern 2
200      1      200                     : last trace range in pattern 2
