Synopsis
		sffbfreq > out.rsf m=1 n=1 n1=50 nd=1 interp=

Parameters
		string interp= interpolation method: maxflat lagrange bspline   int m=1 b[-m, ... ,n]   int n=1 b[-m, ... ,n]   int n1=50 samples in frequency domain is 2*n1+1   int nd=1 nd dimensional filter bank, nd should not be large, or you will need to buy a new disk array