This plot shows the IRDIS photometric zeropoints.


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Photometric standard stars are acquired since start of operations
(2015-04) every 30 days as part of the IRDIS calibration plan in CI mode
in four broad band filters Y, J, H and K. Further setup parameters are
the CPI neutral density filter, the AO loop status and the wavefront sensor
spatial filter. Only closed loop observations are shown in this plot. Open loop observational results are available in the QC1 database.


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Photometric zeropoints are calculated by the IRDIS pipeline recipe since 2017-11.<br> 
The catalogue in use does not contain Y-band magnitudes.<br>
No airmass dependent extinction correction is applied.<br> 
The neutral density filter correction is applied.<br>