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FITS Specification

The technical specification for the FITS format is described in several files; each of these files is a plain ASCII document:

aareadme.txt

AAREADME.TXT provides general overview information about the FITS format.

fits_bas.txt

FITS_BAS.TXT is descriptive information about the FITS format that is updated by NASA on a monthly basis and posted to USENET.

fits_src.txt

FITS_SRC.TXT lists where sources of FITS information, including a FAQ, can be found. This material is updated periodically by the FITS Support Office at NASA GSFC.

format.txt

FORMAT.TXT describes the FITS format.

xtension.txt

XTENSION.TXT describes extensions to the basic FITS format.


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