Program sfpyramid | Pyramid transform 
[SYNOPSIS]
sfpyramid < in.rsf > out.rsf inv=n nu= du=dx u0=x0 eps=0.01
[PARAMETERS]
float   | du | =dx |   | 	
float   | eps | =0.01 |   | 	stretch regularization 
bool    | inv | =n |  [y/n] | 	inversion flag 
int     | nu | = |   | 	
float   | u0 | =x0 |   | 	
[DIRECTORY]
system/seismic
