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<H1><A NAME="SECTION00670000000000000000"> </A> <A NAME="2413"> </A>
<A NAME="context-levels"> </A>
<BR>
Context Levels
</H1>
<P>
Besides the fixed (general) MIDAS commands, the user may dynamically create
new commands any time during a MIDAS session.
Context files provide a way to group commands which relate to a specific
reduction sequence or application package.
<BR>
<BR>
For example, the command <TT>SET/CONTEXT applic1</TT> will execute the MIDAS
procedure <TT>applic1.ctx</TT>, which would contain all the new command
definitions for the application package <TT>applic1</TT> as well as any new
keyword definitions and default settings.
<BR>
Each enabled context has a corresponding context no. which links new
commands to the context in which they were created.
The command <TT>SHOW/COMMANDS</TT> displays all additional MIDAS commands together
with their context no. The context no. 0 is used for all commands which are
created outside a given context.
<BR>
<BR>
Once the user has finished his/her data reduction with <TT>applic1</TT>,
he/she may want to work with package <TT>applic2</TT> on some of his/her data as
well. One could either add all commands of <TT>applic2</TT> on top of the ones
from <TT>applic1</TT> or first remove all the commands from the currently enabled
context, i.e. <TT>applic1</TT>, in one go via the command
<TT>CLEAR/CONTEXT</TT>.
<BR>
<TT>SET/CONTEXT applic2</TT> will then create all the new commands of the
package <TT>applic2</TT>.
<BR>
<BR>
Use <TT>SHOW/CONTEXTS</TT> to display all the currently enabled contexts.
<BR>
Up to 8 different contexts may be enabled at any time (assuming that all
enabled commands fit in the MIDAS command table). <BR>
Some of the currently available
contexts (application packages) are:<BLOCKQUOTE>
<TT>astromet </TT>Astrometric Package<TT>
<BR>
ccdred </TT>Reduction of CCD data<TT>
<BR>
ccdtest </TT>Test of reduction of CCD data<TT>
<BR>
cloud </TT>Model for absorption lines<TT>
<BR>
daophot </TT>Object detection and classification, the DAOPHOT-2
package<TT>
<BR>
do </TT>Data organizer for astronomical observations<TT>
<BR>
echelle </TT>Reduction of echelle spectra<TT>
<BR>
echellec </TT>Reduction of echelle spectra - old (94NOV) context<TT>
<BR>
exsas (*) </TT>Analysis of X-ray data from the ROSAT satellite<TT>
<BR>
feros </TT>Reduction of the FEROS instrument on La Silla<TT>
<BR>
geotest </TT>Utilities to create geometric test frames and other
artificial images<TT>
<BR>
imres </TT>Programs related to image restoration<TT>
<BR>
invent </TT>Object detection and classification, the INVENTORY package<TT>
<BR>
irac2 </TT>Reduction programs for the IRAC2 camera<TT>
<BR>
irspec </TT>Reduction of IRSPEC spectra<TT>
<BR>
iue (*) </TT>IUE-tape reader<TT>
<BR>
long </TT>Reduction of long slit spectra<TT>
<BR>
lyman </TT>Package for multiple-components fitting of interstellar
absorption lines<TT>
<BR>
mos </TT>Package for multiobject spectroscopy<TT>
<BR>
mva </TT>Package for multivariate data analysis<TT>
<BR>
optopus </TT>Package to prepare observations with the<TT>
<BR>
</TT>Optopus facility at La Silla<TT>
<BR>
pepsys </TT>Photometric planning and reductions (extinction<TT>
<BR>
</TT>correction + transformation to std. system)<TT>
<BR>
pisco </TT>Reduction package for data obtained with the PISCO <TT>
<BR>
</TT>instrument at La Silla<TT>
<BR>
romafot </TT>Photometric extraction package, the ROMAFOT software<TT>
<BR>
spec </TT>Package for 1-dim spectra<TT>
<BR>
statist </TT>Statistical tests on tables<TT>
<BR>
surfphot </TT>Deconvolution and rebinning<TT>
<BR>
tsa </TT>Package for analysis of astronomical time series<TT>
<BR>
wavelet </TT>Image processing tools using the wavelet transform</BLOCKQUOTE> <BR>
For example, the command <TT>SET/CONTEXT invent</TT> will activate the commands
related to the <TT>INVENTORY</TT> photometric package.
<BR>
Klicking on the button <TT>Contexts..</TT> in the Midas Help GUI or typing
the command <TT>HELP [CONTEXT]</TT> will display all currently available contexts
at your site.
<BR><BLOCKQUOTE>
<DIV ALIGN="CENTER">
<B>Note</DIV>
<I>The contexts <TT>exsas</TT> and <TT>iue</TT> have been developed at the Max Planck
Institute for Extraterrestrial Physics in Garching, Germany and
ESA Vilspa, Villafranca Satellite Tracking Station, Spain, respectively. They
may be obtained on request from these institutions.</I></B></BLOCKQUOTE>
<P>
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<ADDRESS>
<I>Petra Nass</I>
<BR><I>1999-06-09</I>
</ADDRESS>
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