Figure 7.5: Comparison of XMM-Newton catalogue positions with optical objects from the USNO A2, GSC 2 and APM catalogues

Figure 7.5: Comparison of XMM-Newton catalogue positions with optical objects from the USNO A2, GSC 2 and APM catalogues for detections with likelihood values > 8 and summary quality flag > 3. Plots are for high Galactic latitude (|b| > 20) only.