Synopsis
		sfsttimefreq < time.rsf > timefreq.rsf mask=mask.rsf nw= dw= w0=0. lambda=1.0f window_size=50 phase=n

Parameters
		float dw= f requency step   float lambda=1.0f smoothing parameter   string mask= auxiliary input file name   int nw= number of frequencies   bool phase=n [y/n] output phase instead of amplitude   float w0=0. first frequency   int window_size=50 window_size