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Fig. 3

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Measurements of H12CO+/H13CO+ as a function of RGC and comparison of the derived gradients between different works. Blue dots represent τHCO+ < 3, and black dots represent τHCO+ > 3. The two lower limits are shifted to RGC = 0.5 kpc for better visualization. The red curve denotes the maximum likelihood fit of the blue points only; orange curves denote the 3σ deviation from the MCMC sampling.

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