Volume scat. Line source. . Goff-J. auto.
N s g O f
500 0
4
128.    1500 0 0 0 1.024 0 0
128.    1455   0.00      0.001  0.00 1.4  -2.0 10.0 2.5
128.01 1455  -1555.00   0.001  0.00 1.4  0       0
228.00  1555   0000.00   0.001  0.00 1.4  0.0000  0	

128	Where the interface scatterers start
78 128 51

700 1E8
4096 1 4096 0
4096 400 600 0.0004 0 1.0 2 NR time samples, freq start,end,time step, ranges..