Synopsis
		sfdiffoc < inp.rsf > out.rsf v0=SF_EPS v= pad=nt pad2=2*kiss_fft_next_fast_size((n2+1)/2) extend=4

Parameters
		int extend=4 trace extension   int pad=nt padding for stretch   int pad2=2*kiss_fft_next_fast_size((n2+1)/2) padding for FFT   float v= final velocity   float v0=SF_EPS initial velocity

Used In
		SEP          velspec/impls