Synopsis
		sffourvc0 < 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