Synopsis
		sfroots < poly.rsf > root.rsf niter=10 tol=1.0e-6 verb=y sort=

Parameters
		int niter=10 number of iterations   string sort= attribute for sorting (phase,amplitude,real,imaginary)   float tol=1.0e-6 tolerance for convergence   bool verb=y [y/n] verbosity flag

Used In
		TCCS          asa/dipping asa/sigsep asa/simple asa/tracesep eseis/demo2 eseis/field eseis/nonseis nar/chirp nar/hou nar/mirko nar/trace nar/vecta npm/hou npm/mirko npm/trace npm/vecta-nar seislet/plane seislet/sin2