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AstromExtension Overview

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Attribute nameAttribute typeDocstringUnit
BITPIXintNumber of bits used to store pixel values Standard values are defined in NOST-100.0 The only valid values are: 8 character of unsigned binary integer 16 16-bit twos-complement binary integer 32 32-bit twos-complement binary integer -32 IEEE single precision floating point -64 IEEE double precision floating point [BITPIX]
CD1_1floatGives the translation from array axis n to coordinate axis m. For images the comment should read SS.ss arcsec per pixel [CDn_ms]
CD1_2floatGives the translation from array axis n to coordinate axis m. For images the comment should read SS.ss arcsec per pixel [CDn_ms]
CD2_1floatGives the translation from array axis n to coordinate axis m. For images the comment should read SS.ss arcsec per pixel [CDn_ms]
CD2_2floatGives the translation from array axis n to coordinate axis m. For images the comment should read SS.ss arcsec per pixel [CDn_ms]
filenamestrThe name of the associated file
globalnamestrThe name used to store and retrieve file to and from Storage
NAXISintNumber of axes of the data array (limited to less than 999). A value of 0 signifies that no data follow the header in the HDU (header and data unit). [NAXIS]
PV1floatDescribes the parameter k for the axis n. Required for certain coordinate types [PVn_ks]
PV2floatDescribes the parameter k for the axis n. Required for certain coordinate types [PVn_ks]
XTENSIONstrIndicates start of an extension block in the FITS file. This keyword is mandatory for an extension header and must not appear in the primary header. Possible values are: 'TABLE ' for ASCII tables 'BINTABLE' for binary tables 'IMAGE ' for image extensions [XTENSION]

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