Lorella pointed out a problem with the Swift/XRT data in xselect. The WMAPs do not have -1 in pixels outside the selected region despite having wtmapfix set to yes. The problem arises because the XRT uses the same coordinate system for image and WMAP and extractor automatically resets wtmapfix to no in this case. I fixed this so that in this case the WMAP fix to convert the region from image to wmap coordinates is not done however pixels outside the region are still set to -1.
Keywords: heasoft, extractor, Swift
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