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Algorithm
The program uses local spherical coordinate transformations centred at
the RA and DEC of each image frame. It is assumed that all the images
lie in the same plane as the first image. The validity of this
approximation depends on the size of the final image in degrees and
the number of pixels. As a rough guide, for a 512 x 512 pixel final
image it is accurate for up to a 5 degree by 5 degree field.
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