Point source in infinite medium
N C J
50 0
2
0 1500 0 0 0 1 0
0 1500 0 0 0 1 0
0 
1 5000 51 25
1200 1E8
1024 1 900
0 5 12.5 1
0 5000 12.5 1000
40 70 3