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Despite almost all being acquired as photons, astronomical data from
different instruments and at different stages in
its life may exist in different formats to serve different purposes.
Beyond the data itself, descriptive information is
associated with it as metadata, either included in the data format or in
a larger multi-format data structure. Those
formats may be used for the acquisition, processing, exchange, and
archiving of data. It has been useful to use similar
formats, or even a single standard to ease interaction with data in its
various stages using familiar tools. Knowledge
of the evolution and advantages of present standards is useful before we
discuss the future of how astronomical data
is formatted. The evolution of the use of world coordinates in FITS is
presented as an example.
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