Definition of the Flexible Image Transport System (FITS), version 3.0

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Volume 524 (December 2010)

A&A, 524 (2010) A42

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Table C.1

Mandatory FITS keywords for the structures described in this document.

Primary	Conforming	Image	ASCII table	Binary table	Random groups
HDU	extension	extension	extension	extension	records

SIMPLE	XTENSION	XTENSION¹	XTENSION²	XTENSION³	SIMPLE
BITPIX	BITPIX	BITPIX	`BITPIX = 8`	`BITPIX = 8`	BITPIX
NAXIS	NAXIS	NAXIS	`NAXIS = 2`	`NAXIS = 2`	NAXIS
NAXISn⁴	NAXISn⁴	NAXISn⁴	NAXIS1	NAXIS1	`NAXIS1 = 0`
END	PCOUNT	`PCOUNT = 0`	NAXIS2	NAXIS2	NAXISn⁴
	GCOUNT	`GCOUNT = 1`	`PCOUNT = 0`	PCOUNT	`GROUPS = T`
	END	END	`GCOUNT = 1`	`GCOUNT = 1`	PCOUNT
			TFIELDS	TFIELDS	GCOUNT
			TFORMn⁵	TFORMn⁵	END
			TBCOLn⁵	END
			END

Notes.

⁽¹⁾

XTENSION = ’IMAGE’ for the image extension.

⁽²⁾

XTENSION = ’TABLE’ for the ASCII table extension.

⁽³⁾

XTENSION = ’BINTABLE’ for the binary table extension.

⁽⁴⁾

Runs from 1 through the value of NAXIS.

⁽⁵⁾

Runs from 1 through the value of TFIELDS.

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