1000000              # total photon (not used)
29012391             # RNG seed, negative to generate, old 29012392
75.7604835020458          66.9948002207114          168.218489512914  # source position (mm)
0.1636    0.4569   -0.87435     # initial directional vector
0.0 3.e-09 2e-10   # time-gates(s): start, end, step
brain              # volume ('uchar' format)
409767
1	2            # detector number and radius (mm)
75.34 79.89 170.9 2.0  # detector 1 position (mm)
