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Table C.2

Reserved FITS keywords for the structures described in this document.

All1 Array2 Conforming ASCII table Binary table Random groups
HDUs HDUs extension extension extension records
DATE BSCALE EXTNAME TSCALn TSCALn PTYPEn
ORIGIN BZERO EXTVER TZEROn TZEROn PSCALn
BLOCKED3 BUNIT EXTLEVEL TNULLn TNULLn PZEROn
AUTHOR BLANK TTYPEn TTYPEn
REFERENC DATAMAX TUNITn TUNITn
COMMENT DATAMIN TDISPn TDISPn
HISTORY TDIMn
␣␣␣␣␣␣␣␣ THEAP
DATE-OBS
TELESCOP
INSTRUME
OBSERVER
OBJECT
EQUINOX
EPOCH3
EXTEND4

Notes. 

(1)

These keywords are further categorized in Table C.3.

(2)

Primary HDU, image extension, user-defined HDUs with same array structure.

(3)

Deprecated.

(4)

Only permitted in the primary HDU.

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