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Starting the whole thing

Before you start the MOS context you should have done the following preparations:

For the averaging of the frames you may want to use the command COMBINE/LONG from the context LONG. Now you can start the session with



Midas ...> SET/CONTEXT mos



The initialization of the keywords to their default values is done by



Midas ...> INIT/MOS



If you saved the results of an earlier reduction session with



Midas ...> SAVE/MOS session



you can now initialize these parameters again (and restore all auxiliary tables) with



Midas ...> INIT/MOS session



A demonstration of the package can now be obtained with



Midas ...> TUTORIAL/MOS



which has an automatic (default) and an interactive mode (first parameter) and also allows to look at selected parts of the package (second parameter). In order to create all necessary test data you should run it once automatically.

Most of the numerical parameters are normally set to ``sensible'' values (which only means that they looked reasonable to the people who wrote this context), but the keyword for object ( \fbox{{\small \tt OBJ}}) is empty since there are no sensible defaults for these data. This holds also true for other keywords, which are normally filled either from the headers of your object (etc.) frames or with the results of MOS commands. Thus for the very first try you should just fill in the keyword mentioned above and continue (example see below).



Midas ...> SET/MOS obj=fors0001



If you want to make sure that the setups of your files are all the same use the command CHECK/MOS.

!!! NOT YET IMPLEMENTED !!!
By default it will check the FORS keywords for

If your data were not produced by FORS you may give the FITS keywords that should be compared in an ASCII file. The use is then



Midas ...
> CHECK/MOS file



Now you may start the real business!


next up previous contents
Next: Locating slitlets and flat-field Up: MOS Cookbook - A Previous: MOS Cookbook - A
Petra Nass
1999-06-15