| FITS keyword | content |
| TARGET | Target name |
| RA | Target Right Ascension (J2000.0; HH MM SS) |
| DEC | Target Declination (J2000.0; DD mm ss) |
| EXP | Exposure time (seconds) |
| AIRM | Airmass at start of exposure |
| FILTER | Filter used |
| SLT | Slit used |
| GRIS | Dispersing element used |
| CL | Collimator used |
| LST | Local Siderial Time |
| DC | DPR_CATG = Category of observation (SCIENCE/CALIB/ACQUISITION) |
| DTYPE | DPR_TYPE = Type of observation (e.g. OBJECT; FLAT, LAMP) |
| DTEC | DPR_TECH = Observation technique (e.g. IMAGE; SPECTRUM) |
| OB_ID | Observation Block ID |
| TPL_ID | template ID |
| NX | Total number of exposures within template |
| X# | Running number of exposure within template |
| CON | Conversion factor ('gain') of CCD |
| PORT | Readout mode |
| BIN | Binning in X and Y direction |
| WINDOWS | Number of pixels in X and Y direction |
| archive_filename | ESO Archive file name |
| orig_filename | File name from the Instrument Workstation |
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