Figure 5.2

Figure 5.2: Sky map of XMM-Newton pointings in Hammer-Aitoff projection in Galactic coordinates. Black: 4922 fields common to both 3XMM-DR4 and 2XMMi-DR3; Red: 2505 fields only in 3XMM-DR4; green: 31 fields only in 2XMMi-DR3. 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.