What is MIA+EWS?

MIA stands for MIDI Interactive Analysis, which means

• It does something with MIDI data
• You have to type commands or push the mouse
• It allows you to look at the data

Originally, MIA was written to allow us the MIDI group at MPIA Heidelberg to have a quick look at the data during the observations on Paranal, or shortly after they arrived in Heidelberg, in order to prepare the next observations. Naturally, this requires to calculate the correlated flux and visibility, since this is the main result of the observations. This is the scientific result one usually wants to get from MIDI observations, so MIA can also be used to reduce data and produce publications, although this requires an astronomer who knows what he is doing.

EWS stands for Expert Work-Station. It was written by Walter Jaffe at Sterrewacht Leiden to reduce his MIDI data. It is not as user-unfriendly as the name suggests (Originally, it was planned to write a "User Workstation", too, but nobody has the time to do that).

In 2005, Rainer Köhler started to work at Sterrewacht Leiden. Since the main authors of MIA and EWS now worked together at one institute, we decided to merge both packages. As you will see later in this manual, both ways to reduce MIDI data still co-exist (more or less) peacefully within the package, therefore the name MIA+EWS is quite adequate.

Supported Modes

	Dispersive Elements
	PRISM	fully supported
	GRISM	supported, but not fully tested
	Channels
	HIGH_SENSE	fully supported
	SCI_PHOT	work in progress
	Tracking mode
	undispersed	fully supported
	dispersed	fully supported since version 1.2