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Fig. 3
Distribution in surface density of the positions in the inner Galaxy (black histogram) and in the GPS (red histogram). Top, CO: there are 19 sources above the threshold at Σthr,CO = 274 M⊙ pc-2 (dashed vertical line). Bottom, Dust: there are 16 sources above the threshold at Σthr,dust = 496 M⊙ pc-2 (dashed vertical line).
This figure is made of several images, please see below:
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