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   <title>Montage mViewer Introduction</title>

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<h1> Montage Viewer:  Overlay Basics</h1>

mViewer has built-in functionality to draw overlays on the image.  So far these include
the following:</p>

<ul>
   <li> Coordinate grids </li>
   <li> Astronomical source (catalog) scaled symbols </li>
   <li> Image metadata (outlines) </li>
   <li> Markers (individual symbols) </li>
   <li> Labels</li>
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