Program sftspline | Helix filters for spline in tension 
[SYNOPSIS]
sftspline > flt.rsf tension=0. niter=20 eps=FLT_EPSILON lag=
[PARAMETERS]
float   | eps | =FLT_EPSILON |   | 	tolerance for filter compressing 
string  | lag | = |   | 	
int     | niter | =20 |   | 	number of iterations 
float   | tension | =0. |   | 	spline tension 
[DIRECTORY]
user/gee
