Seabed scat. Point source. M=<order>.
B N O s g  
500 0
4
  0.    1500      0     0     0     1      0       0
  0.    1500      0     0     0     1      0       0
128.    1500      0.00  0.0  0.00  1.0  -2.0 -10.0 0 2.1 1.0 1.0
138.00  1500   0000.00  0.0  0.00  1.0  0.0000  0	

128.
77. 127. 51

1200 1E8
-1 1 1 0
2048 480 520 0.0003 0 0.2 2