The primary criterion for selection of X-ray sources is having identified optical counterparts, but not all do. Positions are are taken from the USNO NOMAD database and are mean places for the middle of the years given below. The X-ray flux in the 2 - 10 keV energy range is given in micro-Janskys (μJy) in the column headed Flux. In some cases, a range of flux values is presented, representing the variability of these sources. The identified optical counterpart (or companion in the case of an X-ray binary system) is listed in the column headed Identified Counterpart. The type of X-ray source is listed in the column headed Type. Neutron stars in binary systems that are known to exhibit many X-ray bursts are designated ''B'' for Burster. X-ray sources that are suspected of being Black Holes have the ''BHC'' designation for Black Hole Candidate. Supernova remnants have the ''SNR'' designation. Other neutron stars in binaries which do not burst and are not known as X-ray pulsars have been given the ''NS'' designation. All codes in the Type column are explained at the end of the table (page H76).