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F Summary of Keywords

(This Appendix is not part of the NOST FITS Standard, but is included for convenient reference).

Table F.1: Mandatory FITS keywords for the structures described in this document.
Principal HDU	Conforming Extension	ASCII Table Extension	Image Extension	Binary Table Extension	Random Groups Records
`SIMPLE`	`XTENSION`	`XTENSION`¹	`XTENSION`²	`XTENSION`³	`SIMPLE`
`BITPIX`	`BITPIX`	`BITPIX = 8`	`BITPIX`	`BITPIX = 8`	`BITPIX`
`NAXIS`	`NAXIS`	`NAXIS = 2`	`NAXIS`	`NAXIS = 2`	`NAXIS`
`NAXISn`⁴	`NAXISn`⁴	`NAXIS1`	`NAXISn`⁴	`NAXIS1`	`NAXIS1 = 0`
`EXTEND`⁵	`PCOUNT`	`NAXIS2`	`PCOUNT = 0`	`NAXIS2`	`NAXISn`⁴
`END`	`GCOUNT`	`PCOUNT = 0`	`GCOUNT = 1`	`PCOUNT`	`GROUPS = T`
	`END`	`GCOUNT = 1`	`END`	`GCOUNT = 1`	`PCOUNT`
		`TFIELDS`		`TFIELDS`	`GCOUNT`
		`TBCOLn`⁶		`TFORMn`⁶	`END`
		`TFORMn`⁶		`END`
		`END`

¹ XTENSION= 'TABLE ' for the ASCII table extension.
² XTENSION= 'IMAGE ' for the image extension .
³ XTENSION= 'BINTABLE' for the binary table extension .
⁴ Runs from 1 through the value of NAXIS.
⁵ Required only if extensions are present.
⁶ Runs from 1 through the value of TFIELDS.

Table F.2: General reserved FITS keywords described in this document.
All HDUs	Array¹ HDUs	Conforming Extension	ASCII Table Extension	Binary Table Extension	Random Groups Records
`DATE`	`BSCALE`	`EXTNAME`	`TSCALn`	`TSCALn`	`PTYPEn`
`ORIGIN`	`BZERO`	`EXTVER`	`TZEROn`	`TZEROn`	`PSCALn`
`BLOCKED`²	`BUNIT`	`EXTLEVEL`	`TNULLn`	`TNULLn`	`PZEROn`
`AUTHOR`	`BLANK`		`TTYPEn`	`TTYPEn`
`REFERENC`	`CTYPEn`		`TUNITn`	`TUNITn`
`COMMENT`	`CRPIXn`			`TDISPn`
`HISTORY`	`CROTAn`			`TDIMn`
	`CRVALn`			`THEAP`
`DATE-OBS`	`CDELTn`
`TELESCOP`	`DATAMAX`
`INSTRUME`	`DATAMIN`
`OBSERVER`
`OBJECT`
`EQUINOX`
`EPOCH`²

¹ Primary HDU, image extension, user-defined HDUs with same array structure.
² Deprecated.

Table F.3: General reserved FITS keywords described in this document
Production	Bibliographic	Commentary	Observation
`DATE`	`AUTHOR`	`COMMENT`	`DATE-OBS`
`ORIGIN`	`REFERENC`	`HISTORY`	`TELESCOP`
`BLOCKED`¹			`INSTRUME`
			`OBSERVER`
			`OBJECT`
			`EQUINOX`
			`EPOCH`¹

¹ Deprecated.

Next: G ASCII Text Up: Definition of the Flexible Previous: E Differences from IAU-endorsed

5/13/1999