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<span id="index-0"></span><span id="id1"></span><h1>Catalog files<a class="headerlink" href="#catalog-files" title="Permalink to this headline">¶</a></h1>
<p>Catalog files speed up your work in case you often observe particular
star field, for example in long-term monitoring of a variable star. In a standard
work flow, you would have to mark the stars again and again. The catalog
file’s structure is similar to that of the photometry file, except it includes
the selection of stars. When you use the catalog file as a reference frame
in the matching phase, the program will match the photometry files against
it and the selection of stars is restored as well. Then, when you make a light
curve, the variable, comparison and check stars are already marked.</p>
<p>The first observation you process by standard procedure, using one frame from
a set as a reference file. When you have finished, you can make a catalog
file. Click on the <em class="menuselection">Tools ‣ Make catalog file</em> item in the main
menu. A new dialog appears that allows you to select a variable star, a comparison
star and optionally check one or more check stars. If you have made a light curve
before, the stars are automatically selected.</p>
<p>Confirm the selection dialog by the <em class="guilabel">OK</em> button to proceed
to the next step. Another dialog appears. In its left part, fill in the edit fields,
you have to fill in the name of the catalogue file (first entry), all other fields
are optional and you can left them blank. Confirm the dialog by the
<em class="guilabel">Save</em> button.</p>
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<img alt="Sample catalog files" src="_images/makecatalog.png" />
<p class="caption">The dialog for making a catalog file.</p>
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