Fig. B1.1
The integrated intensity of the Galactic center region in HCO+ (1 − 0) in velocity intervals of 10 kms-1 width. The solid contour levels start at 0.46 K kms-1, which is the 5σ-level, and increase in steps of 1.4 K kms-1 (15σ). The dotted contours is at 0.28 K kms-1 (3σ).
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