Synopsis
		sfheaderwindow mask=head.rsf < in.rsf > out.rsf inv=n

The input data is a collection of traces n1xn2,
mask is an integer array os size n2, windowed is n1xm2,
where m2 is the number of nonzero elements in mask.

Parameters
		bool inv=n [y/n] inversion flag   file mask= auxiliary input file name

Used In
		CWP          jse2006RWEImagingOverturningReflections/sigsbee   DATA          alaska/line31-81-m8r