Collinder 261 Chandra X-Ray Point Source Catalog
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https://b2find.eudat.eu/dataset/01311099-25ae-57e8-bc7b-3ce4621a25c9
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This table contains some of the results from the first X-ray study of Collinder 261 (Cr 261), which at an age of 7 Gyr is one of the oldest open clusters known in the Galaxy....
