Uhuru Fourth (4U) Catalog
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https://b2find.eudat.eu/dataset/0520a107-7811-57a3-ad63-80a3a7970ad6
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资源简介：
The Fourth Uhuru (4U) Catalog lists 339 X-ray sources that were observed with the Uhuru (SAS A) X-ray observatory. It contains positional information in the form of 90%...
