Synopsis
		sffpow < inp.rsf > out.rsf beta=beta.rsf niter=10 fmin=o1 fmax=o1+(n1-1)*d1 bmin=-1.0 bmax=1.0 nb=10 tol=SF_EPS verb=y time=n

Parameters
		file beta= auxiliary output file name   float bmax=1.0 maximum value of beta   float bmin=-1.0 minimum value of beta   float fmax=o1+(n1-1)*d1 maximum frequency   float fmin=o1 minimum frequency   int nb=10   int niter=10 number of Newton iterations   bool time=n [y/n] time axis   float tol=SF_EPS accuracy tolerance for beta   bool verb=y [y/n] verbosity flag