Fig. 5
Top: histogram of the distribution of 6.7 GHz masers in Galactic longitude (integrated over all Galactic latitudes). The bin size is 1.5°. The peak of the distribution is largely due to the cluster of 11 masers in Sgr B2. Bottom: histogram of the distribution of 6.7 GHz masers in Galactic latitude (integrated over all Galactic longitudes). The bin size is 0.15°. The masers are distributed around the Galactic equator.
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