#  type  matter  c    de maxpath  / x y z  a  b c 
 This is to test <dE/dx> of a given media.  Only one component
 may be written
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1   box  Al  0  0      / 0  0  0  10 10 1
2   box  Cu   0  0      / 0  0  +  10 10 1
3   box  Pb    0  0      / 0  0  +  10 10 1
4   box  SCIN    0  0      / 0  0  +  10 10 1
5   box  sp    0  0      / 0  0  +  10 10 1
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