Program sfspefcstep | Streaming prediction-error filter with constant step. 
[SYNOPSIS]
sfspefcstep < inp.rsf > out.rsf infil=infil.rsf verb=n na= ngp=0 lambda1= lambda2=0.0f
[PARAMETERS]
string  | infil | = |   | 	initial filter (auxiliary input file name)
float   | lambda1 | = |   | 	constant scale parameter in time axis 
float   | lambda2 | =0.0f |   | 	constant scale parameter in space axis 
int     | na | = |   | 	filter size 
int     | ngp | =0 |   | 	constant step 
bool    | verb | =n |  [y/n] | 	
[DIRECTORY]
user/yliu
