100000000                   # total photon
27182820            # RNG seed, negative to generate
30. 30. 0.0        # source position (mm)
0. 0. 1.                # initial directional vector
0.e+00 5.e-09 1.e-10  # time-gates(s): start, end, step
mesh2                # volume ('uchar' format)
8                    # index of elem that encloses the source
4	1            # detector number and radius (mm)
30.0	20.0	0.0  # detector 1 position (mm)
30.0	40.0	0.0  # ...
20.0	30.0	0.0
40.0	30.0	0.0
