The MID-infrared Interferometric instrument (MIDI) is one of the three instruments which will equip the focus of the Very Large Telescope Interferometer (VLTI). This page presents the MIDI data reduction software. For information about MIDI in general, go to the MIDI web page at MPIA Heidelberg.


The packages for MIDI data reduction developed in Leiden and Heidelberg have been merged into one package with the uninspired name MIA+EWS. A number of different versions are available from the download page.


The tar-file contains the source code for the packages formerly known as MIA and EWS. It was tested and found working on Linux machines, Solaris and HP-UX should work, but were not tested. To install it, first unpack the tar-file:

      tar xvfz MIA+EWS-2.0.tar.gz
(You may have to type gtar if your standard tar is not GNU-tar).

This will create a directory called "MIA+EWS-2.0". Cd to this directory and call make:

      cd MIA+EWS-2.0
      make gui
If all goes well, it will compile and setup everything and tell you in the end how to start the software. If there is an error, read the file install.log or send it to one of us.

If you don't like the installation wizard and/or don't want to use it, type

      make clinstall
This will carry out the same steps as the installation wizard, but it sends all the output to your terminal. It is up to you to notice if something goes wrong.


Here is a draft version of a manual for MIA+EWS.

There is a wiki at MPIA, where a collection of tips and tricks for MIDI data reduction shall be gathered.

You might also want to read chapters 7 - 9 in Thorsten Ratzka's PhD thesis, which is avaible online from the library of the University Heidelberg.

There are also quite a few older pages describing how to use MIA and/or EWS:

Mailing List

There are two mailing lists, one for announcements and one for discussions about MIDI data reduction. If you want to subscribe, write an email to Leonard Burtscher.


Cheddar, the special expert's tool for preparing MIDI observations, is over here.

MIDI Links

A large amount of MIDI related information is available at

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this page was created by Rainer Köhler