Program sfheaderwindow | Window a dataset based on a header mask.
[SYNOPSIS]
sfheaderwindow mask=head.rsf < in.rsf > out.rsf inv=n
[COMMENTS]

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
[DIRECTORY]
system/main
