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Paper: Representations of World Coordinates in FITS
Volume: 216, Astronomical Data Analysis Software and Systems IX
Page: 571
Authors: Calabretta, M.; Greisen, E. W.
Abstract: The original FITS papers provided a simplified, non-specific method for describing the physical coordinate values of image pixels. In the intervening 20 years, there have been a number of implementations of coordinates in astronomical software packages and several attempts to obtain agreement on their representation in FITS. A general consensus on the important details has been obtained and is described here.
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