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Fig. A.1

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Top: emission from the CMZ and M+3.2+0.3 integrated over velocity from  − 230 to 270 km s-1. This plot shows the more northerly part of the CMZ in more detail and includes source names. The solid contour levels start at 1.9 K kms-1 (3σ) and increase in steps of 12.53 K kms-1 (20σ). Middle: emission integrated over the velocity range listed above this plot in SiO. The solid contours start at 1.09 K kms-1 (3σ) and increase in steps of 5.46 K kms-1 (10σ). Bottom: emission from the CMZ and M+3.2+0.3 integrated over the velocity range listed above this plot in H13CO+. The solid contours start at 0.89 K kms-1 (3σ) and increase in steps of 2.97 K kms-1 (10σ). In all plot, the dashed line show the coverage of the survey in each molecule.

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