| BITPIX | int | Number 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] | |
| filename | str | The name of the associated file | |
| globalname | str | The name used to store and retrieve file to and from Storage | |
| NAXIS | int | Number 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] | |
| XTENSION | str | Indicates 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] | |
