#  type  matter  c    de maxpath / x0   y0   z0   a  b  c
#   double clad by pipe
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1  cyl_x  SciFi  0 3102 0 / 0 0 0 0.1d0  10.
2  pipe_x   SciFi  0 3112 0 / 0 0 0 0.1d0 0.11d0  10. 
3  pipe_x   SciFi  0 3122 0 / 0 0 0 0.11d0 0.12d0 10. 
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