Shallow water. S/N=+10. 2 sources.
E H  M Q1 D 
100 100 1 0

15
10 0 0 1 0
15 0 0 1 0
20 0 0 1 0
25 0 0 1 0
30 0 0 1 0
35 0 0 1 0
40 0 0 1 0
45 0 0 1 0
50 0 0 1 0
55 0 0 1 0
60 0 0 1 0
65 0 0 1 0
70 0 0 1 0
75 0 0 1 0
80 0 0 1 0

0.01 99.99 23
0.1 19.9 81 
0 0 1

0

0 20 20 5
0 100 12 20