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<span id="index-0"></span><span id="id1"></span><h1>Choose aperture (dialog)<a class="headerlink" href="#choose-aperture-dialog" title="Permalink to this headline">¶</a></h1>
<p>The “Choose aperture” dialog is used to select an aperture. During the photometry, each object is
measured using a set of predefined apertures of different sizes. The best aperture size depends on
width of objects and background noise level, these parameters vary for each run.</p>
<div class="section" id="selecting-the-aperture">
<span id="index-1"></span><h2>Selecting the aperture<a class="headerlink" href="#selecting-the-aperture" title="Permalink to this headline">¶</a></h2>
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<img alt="Choose aperture dialog" src="_images/chooseaperture_couts.png" />
<p class="caption">The dialog for selecting an aperture</p>
</div>
<p>(1) The table of defined apertures is displayed here.</p>
<p>(2) The list of available data sets are available is shown here. Separate data sets are made
for each couple of a comparison star (C) and a check star (K1, K2, etc.).</p>
<p>The graph of curve of deviations as a function of aperture index (3) is shown in the
right part of the dialog. The point that corresponds to the currently selected aperture is
highlighted.</p>
<p>Left click on a point in the graph selects the aperture.</p>
<p>Click the “OK” button (4) to save the selection.</p>
<ul class="simple">
<li>Usually the best aperture corresponds to the minimum of the curve.</li>
<li>The matching must be applied before the matching.</li>
<li>At least one comparison and one check star must be selected before the dialog is activated.</li>
</ul>
<div class="admonition-see-also admonition seealso">
<p class="first admonition-title">See also</p>
<p class="last"><a class="reference internal" href="choose_stars_dialog.html#choose-stars-dialog"><em>Choose stars (dialog)</em></a>, <a class="reference internal" href="light_curve_dialog.html#light-curve-dialog"><em>Light curve (dialog)</em></a></p>
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<li><a class="reference internal" href="#selecting-the-aperture">Selecting the aperture</a></li>
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