NCSU neutron porosity logging tool -- limestone of 20 PU 
1     1   -0.000502   -1   7   -8                  $ near detector
2     1   -0.000502   -2   9   -10                $ far  detector
3     2   -7.8        -3   6   -11  #1  #2         $ tool
4     3   -1.0        -4   3    6   -11               $ borehole
5     4   -2.36      -5   4    6   -11               $ formation
6     0                   5:-6:11                         $ outside world

1     cz   1.27
2     cz   2.54
3     cz   3.81
4     c/z  -6.35  0.0   10.16
5     cz   1000.0
6     pz   -500.0
7     pz   15.24
8     pz   22.86
9     pz   38.10
10    pz   63.50
11    pz   800.0

mode   n
imp:n  1  4r  0
sdef   erg=d1
si1    h  0.0   0.15  0.50  1.67  2.24  3.03  3.22  4.09
          5.02  5.91  7.20  7.83  8.72  9.20  10.22
sp1    d  0.0   0.1052183  0.0811733  0.0335948  0.0581514
          0.1139154  0.1427353  0.1021487  0.1193724
          0.0765689  0.0492838  0.0632674  0.0187585
          0.0153479  0.0204639   
m1     2003.50c    1.0
m2     26000.55c   1.0
m3     1001.50c   0.6667   8016.50c   0.3333 
m4     1001.50c   -0.0094     6000.50c   -0.1098  
          8016.50c   -0.5147     20000.51c  -0.3661  
mt3    lwtr.01t
mt4    lwtr.01t
idum    3    1   25 
                  -1   13 
                   1   29
                   1     1
rdum            -50      60.3  
                   0.001        51     
                      -40      95.1 
                         0     1e20
wwg    14   3   0.0   0.0   0.0  0.0
wwge:n  1e-7   1e-5   1e-3  2e-1  12
f4:n    1
fm4    -38.6111  1   103  
f14:n   2
fm14   -514.815  1   103 
prdmp  -400       -2000
nps     400000