Synopsis
		sfatm1 < in.rsf > out.rsf nfw= alpha= boundary=n

median filter (alpha=0.5); mean filter (alpha=0.)

Parameters
		float alpha= 0.0 <= alpha <= 0.5: median filter (alpha=0.5); mean filter (alpha=0.)   bool boundary=n [y/n] if y, boundary is data, whereas zero   int nfw= filter-window length (positive and odd integer)