When a TRACK, CALIB file is successfully processed, the object is checked against a list of MIDI calibrators. This list is used by the ESO web-based Calibrators Selector CalVin which is available on line. This list is updated for each Period.

If the estimated diameter of the calibrator is available from the database, a theoritical visibility and its associated error are calculated by the pipeline. The instantaneous transfer function is calculated using the theoritical and the measured visibilities.

The data from 2006 have been re-processed with the midi pipeline v 2.0.4 and the CalVin database compiled for P81 and including 448 calibrators.

Each 6 months the calibrator database is updated.

The instrumental Transfer Function trending plots are available from the MIDI HC page. The Transfer Function plots are grouped by instrument mode (HIGHSENS or SCIPHOT) , per telescopes (UT or AT) and dispersive element (GRISM or PRISM). The TF is given in 4 different bins (9microns, 10.46microns, 11.79 microns 12.8microns).The 8.64micron bin is also available in the ASCII file but there is no trending. For the ATs, there are different pages for baselines less than 70m and for baselines more than 70m. From there the user can navigate through the history files to display previous data.

• for UT baselines (HIGHSENS/PRISM/10.46 microns filter)
• for AT baselines (less than 70m/HIGHSENS/PRISM/10.46 microns filter)

For the data from 2006, several links are available: