Figure 5.2: Sky map of XMM-Newton pointings in Hammer-Aitoff projection in Galactic coordinates. Blue: 3XMM-DR4 fields and Red: 3XMM-DR5 fields. The galactic longitude ranges from -180 degrees (left) to +180 (right), while the lower and upper poles are at -90 and +90 degrees in galactic latitude respectively.