Drift space example
 $cont npart=1000 nprnt=3 prlevel=1 $
 $bmt $
1 2 1. 1        
0.    0.0     0.        0.      0.      0.200  !mean: x y z px py pz
3e-3  3e-3    0.01      0.005   0.005   0.010  !sigs
0
 $ints $
 $nhs  $
 $nsc  nscat =1 $
-0.10 5e-3 40 1 2   -0.10 10e-3 20 2 2
 $nzh  $
 $nrh  $
 $nem  $
 $ncv  $
SECTION
SREGION
1.00   1  0.003
1  0.  0.10
NONE
  0. 0. 0. 0. 0.   0. 0. 0. 0. 0.     0. 0. 0. 0. 0.
VAC             
CBLOCK
   0. 0. 0. 0. 0.   0. 0. 0. 0. 0.
ENDSECTION