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Table 4
Main FITS header keywords and their meaning.
| Keyword | Data type | Meaning |
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| OBJECT | string | Name of the target galaxy |
| CALIFAID | integer | ID of the galaxy |
| NAXIS1 | integer | Number of pixels along right ascension axis (Nα) |
| NAXIS2 | integer | Number of pixels along declination axis (Nδ) |
| NAXIS3 | integer | Number of pixels along wavelength axis (Nλ) |
| CRPIX1 | float | Reference pixel of the galaxy center in right ascension |
| CRVAL1 | float | Right ascension α (J2000) of the galaxy center in degrees |
| CDELT1 | float | Sampling along right ascension axis in arcsec |
| CRPIX2 | float | Reference pixel of the galaxy center in declination |
| CRVAL2 | float | Declination δ (J2000) of the galaxy center in degrees |
| CDELT2 | float | Sampling along declination axis in arcsec |
| CRVAL3 | float | Wavelength of the first pixel along the wavelength axis in Å |
| CDELT3 | float | Sampling of the wavelength axis in Å |
| hierarch PIPE VERS | string | Version of the reduction pipeline |
| hierarch PIPE UNITS | string | Units of the flux density |
| hierarch PIPE GALEXT AV | float | Galactic V band extinction along line-of-sight |
| hierarch PIPE REDUDATE | string | Date/time the data were reduced |
| hierarch PIPE VMAG 3SIG | float | Estimated 3σ surface brightness depth in mag arcsec-2 |
| MED_VEL | float | Estimated systemic velocity in km s-1 |
| hierarch PPAK PREF DATE-OBS | string | Date/time of the observation |
| hierarch PPAK PREF UT_START | float | Start of the observation in seconds UT time |
| hierarch PPAK PREF UT_END | float | End of the observation in seconds UT time |
| hierarch PPAK PREF MJD-OBS | float | Modified Julian date of the observation |
| hierarch PPAK PREF AIRMASS | float | Airmass during the observation |
| hierarch PPAK PREF EXPTIM | float | Exposure time of the observation |
| hierarch PPAK PREF HVCOR | float | Line-of-sight difference to helocentric velocity |
| hierarch PPAK PREF EXT_V | float | V band atmospheric extinction in magnitudes |
| hierarch PPAK PREF PIPE FLEX XOFF | float | Measured flexure offset in x-direction in CCD pixels |
| hierarch PPAK PREF PIPE FLEX YOFF | float | Measured flexure offset in y-direction in CCD pixels |
| hierarch PPAK PREF PIPE SPEC RES | float | Homogenized spectral resolution (FWHM) in Å |
| hierarch PPAK PREF PIPE SKY MEAN | float | Mean surface brightness (μsky) during observation |
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