Quality Control and
Data Processing

The following calibration data are taken as part of the VISIR calibration plan. The data types are identified by the DPR TYPE keyword in the FITS headers.

frame	DPR.CATG	DPR.TYPE	DPR.TECH	purpose	N*
DARK	CALIB	DARK	IMAGE or SPECTRUM	read-out noise, dark current	10
STD IMG	CALIB	STD	IMAGE,CHOPNOD	sensitivity, conversion factor, mean background	2
STD SPC	CALIB	STD	SPECTRUM,CHOPNOD	telluric correction, flux calibration, sensitivity	2
STD ECH	CALIB	STD	ECHELLE	telluric correction, flux calibration, sensitivity	2

* N: typical number taken per night and setting