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Astrometry
If astrometry information is present in the first input datafile and
a subsequent one then the program will calculate the offsets of the
second file from the first using the RA, DEC, ROLL and axis
information.
The second file is rebinned and rotated such that it has the same pixel
size as the first file in axis coordinates and has the same orientation
to North. It can then be added onto the first using the calculated
offsets.

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