Blank images based on primary beam #23
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Adds a small utility script to blank images made with WSClean beyond a certain level of the primary beam. It will read
<image>-MFS-image.fits,<image>-MFS-image-pb.fitsand<image>-MFS-beam-0.fits(or their non-MFS variants) and replaces values where the primary beam drops below the specified level with NaN.