Figure 5.3
Figure 5.3: Sky area as a function of net exposure time (based on vignetted exposure maps) for 2XMMi-DR3 catalogue fields. The red curve shows the total sky area without corrections for field overlaps, while the blue line shows the 'actual' sky area corrected for field overlap. Arrows indicate the total sky areas of the 2XMMi (magenta) and 1XMM (green) catalogues, without (solid line) and with (dashed line) corrections.