Notes. Table 7 is available in its entirety at the CDS. Interesting sources mentioned in the text are shown here for guidance regarding its form and content. Column (1): X-ray catalog sequence number, sorted by RA. Column (2): IAU designation. Columns (3) and (4): right ascension and declination (in decimal degrees) for epoch J2000.0. Column (5): Estimated standard deviation of the random component of the position error, . The single-axis position errors, σ_x and σ_y, are estimated from the single-axis standard deviations of the PSF inside the extraction region and the number of counts extracted. Column (6): Off-axis angle. Columns. (7) and (8): Net counts extracted in the total energy band (0.5–8 keV); average of the upper and lower 1σ errors on Col. (7). Column (9): background counts expected in the source extraction region (total band). Column (10): net counts extracted in the hard energy band (2–8 keV). Column (11): fraction of the PSF (at 1.497 keV) enclosed within the extraction region. A reduced PSF fraction (significantly below 90%) may indicate that the source is in a crowded region. Column (12): photometric significance computed as net counts divided by the upper error on net counts. Column (13): logarithmic probability that extracted counts (total band) are solely from background. Some sources have P_B values above the 1% threshold that defines the catalog because local background estimates can rise during the final extraction iteration after sources are removed from the catalog. Column (14): source anomalies: (g) fractional time that source was on a detector (FRACEXPO from mkarf) is  < 0.9. Column (15): variability characterization based on K-S statistic (total band): (a) no evidence for variability (0.05 < P_KS); (b) possibly variable (0.005 < P_KS < 0.05); (c) definitely variable (P_KS < 0.005). No value is reported for sources with fewer than four counts or for sources in chip gaps or on field edges. Column (16): effective exposure time: approximate time the source would have to be observed at the aimpoint of the ACIS-I detector in Cycle ??? to obtain the reported number of net counts (see ... Column (17): background-corrected median photon energy (total band)).