... GPI Data Pipeline 1.0 documentation . ... Calibration Database . Rules for Matching Files . ... When you request a calibration file, the first step is to select all calibration files of a given type (for instance, all darks, or all wavelength calibrations). ... Because the instrument configuration or detector properties can change significantly whenever you warm up the IFS, by default we then restrict our consideration to only calibration files taken from the same cooldown run as the science data. ...