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First point your browser to the Aladin Java applet (1) at http://aladin.u-strasbg.fr/AladinJava
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Click on "Load..." to bring up the Server Selector window (2).
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Click on the "File" tab at the top of that window (3), then browse
in your local machine for the image file. If you would like a sample image file, download this FITS image of a galaxy cluster.
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Click the "Submit" button (5), and you should now see your image
displayed.
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Next, click on the right of the Server Selector the "NED" tab
(4).
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Click "Submit" again (5), and you should see the NED sources overlaid
on your image (6). You can get more information about each of these sources
by clicking on it.
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Aladin can do much more that this simple overlay. Read about Aladin in the "Help...." tab.