Figure 5.4

Figure 5.4: Sky area as a function of net exposure time (based on vignetted exposure maps) for 2XMMi catalogue fields. The black histogram shows the total sky area without corrections for field overlaps, while the blue histogram shows the 'actual' sky area corrected for field overlap. Arrows indicate the total sky areas of the 2XMM (red) and 1XMM (green) catalogues, without (solid line) and with (dashed line) corrections.