| 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 |
| PRO_TYPE | Classification of the data product |
| D_TECH | DPR_TECH = Observation technique (e.g. IMAGE; SPECTRUM) |
| OB_ID | ESO Observation Block ID |
| NX | Total number of exposures within template |
| X# | Number of exposure within template |
| CON | Conversion factor ('gain') of CCD |
| PORT | Readout mode (A: single port; ABCD: four port) |
| BIN | Binning in X and Y direction |
| WINDOWS | Number of pixels in X and Y direction |
| OVER% | Percentage of overexposed pixels |
| PIPE_FILENAME | File name of reduced frame |
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