Program sfmodrefl2 | Normal reflectivity modeling. 
[SYNOPSIS]
sfmodrefl2 < in.rsf > out.rsf nt= dt= nw=4
[COMMENTS]

In this version, the input contains Vp, Vs, and density into one file. 
The output contains PP intercept, PP gradient, and PS gradient.


[PARAMETERS]
float   | dt | = |   | 	time sampling 
int     | nt | = |   | 	time samples 
int     | nw | =4 |   | 	interpolation length 
[DIRECTORY]
system/seismic
