Table 7: Values of the accumulative absorbing column density towards the NW, SW and CE as obtained from CO and HI observations for several LSR radial velocities or equivalently for several distances. The values of $N_{{\rm H}}$ which are in bold font are those compatible with the X-rays.
V $_{{\rm LSR}}$ D $N_{{\rm H}}$ (1022 cm-2)
(km s-1) (kpc) NW SW CE
-0.4 0.14 0.43 0.50 0.38
-3.0 0.58 0.52 0.60 0.48
-5.6 0.98 0.62 0.71 0.56
-8.2 1.33 0.74 0.83 0.65
-10.9 1.67 0.89 0.97 0.76
-13.5 1.97 1.03 1.12 0.85
-16.0 2.24 1.14 1.22 0.92
-18.6 2.50 1.21 1.28 0.97
-21.2 2.74 1.27 1.33 1.01
-23.8 2.96 1.35 1.37 1.05
-26.5 3.17 1.44 1.42 1.08


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