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NASA HEASARC's XRAY database consolidates selected parameters from almost all its X-ray catalogs where source positions are located to better than a few arcminutes. This master table provides general information about X-ray sources, including entries where measurements are upper limits rather than detections. The catalog is updated periodically when component database tables are modified or added.
License is listed as 'other-license-specified'; users should verify terms. The HEASARC recommends checking original tables for complete source information.