#  type  matter  c    de maxpath  / x y z  a  b c 
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1   box  pb   0  0    / 0  0  0   10 10 1
#         proton target x-sec is by H2 gas
2   box  H2   0  0    / 0  0  +   10 10 1
3   box  scin 0  0   / 0  0  +   10 10 1
4   box  W    0  0    / 0  0  +   10 10 1
5   box_w sp  0  0  0  / 0  0  0
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