Point source. Mean field.
N O s g 
500 0
4
  0.    1500      0     0     0     1      0       0
  0.    1500      0     0     0     1      0       0
128.    1700      0.00  0.2  0.00  1.0  0.5000  0
138.00  1700   0000.00  0.2  0.00  1.0  0.0000  0	

100.
77. 127. 51

1200 1E8
-1 1 1 0
4096 480 520 0.0003 0 .5 2