We provide quality checks for the MIDI data in the same way as for data from the other VLT instruments. New instrument modes and settings are introduced, for these the data processing pipeline is under test and provides only basic quality checks.

QC0 involves checks whether the user-defined observational constraints have been respected during the observation. The QC0 checks are done on the raw data (SCIENCE or astronomical CALIB).

The Service Mode observer receives a QC0 report which lists all the programme-specific science files, their user-defined constraints (as read from the OB Repository which was filled from P2PP), and the actual QC0 parameters during observation (as read from the Ambient Database which is fed from the Ambient Site Monitor).

Furthermore, the user also receives an OB status report which contains, per OB, the assessment by the on-site staff of the quality of the raw data.

The user constraints for P75 were:

• Seeing,
• Sky transparency,
• LST constraints
• Baseline choice
• Science/calibrator matching.

The data will be checked for several of these constraints.

Quality Control Level 1 consists of quality checks on pipeline-processed data.

• On the individual observations, the QC1 parameters do quality checks on
  • the presence of correlated flux (down to around 10% of uncalibrated visibility)
  • the stability of the photometric signal (for the HIGH SENS instrument mode)
  • the stability of the interferometric signal, which affect the error on the uncalibrated visibility.
• On longer time schedule (nighthly and longer), , QC1 controls
• the stability of the instrumental Transfer Function.

Find access to the MIDI QC1 and trending site here.

Trending is monitoring QC1 parameters over time (e.g. Transfer function of the instrument). Investigating the mutual relations of QC1 parameters is also part of trending. Find access to the MIDI QC1 and trending site here.