Synopsis
		sffourvc < in.rsf > out.rsf eps=0.01 pad=n1 pad2=2*kiss_fft_next_fast_size((n2+1)/2) verb=n nv= dv= extend=4

Parameters
		float dv=   float eps=0.01   int extend=4 trace extension   int nv=   int pad=n1   int pad2=2*kiss_fft_next_fast_size((n2+1)/2)   bool verb=n [y/n] verbosity flag

Used In
		JSG          diffr/chan3d diffr/gom diffr/fault shape/beivc   SEP          vc2/elfvc vc2/vcspk vc2/beivc vc2/sigvc velspec/impls velspec/sigvc