Surveying the Whirlpool at Arcseconds with NOEMA (SWAN) - III. 13CO/C18O ratio variations across the M51 galaxy

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Table B.1.

Ratio of medians for ¹²CO(1-0)/¹³CO(1-0) and ¹²CO(1-0)/C¹⁸O(1-0) by region.

Region	${\tilde{R}}_{13}^{12}$ $\mathrm{{\widetilde{R}}^{12}_{13}}$	${\tilde{R}}_{18}^{12}$ $\mathrm{{\widetilde{R}}^{12}_{18}}$
Whole FoV	9.63 ± 0.04	41.8 ± 0.5
Nuclear bar	6.24 ± 0.03	24.1 ± 0.2
Molecular ring	7.76 ± 0.03	30.1 ± 0.2
Northern spiral arm	9.36 ± 0.06	43.0 ± 0.9
Southern spiral arm	11.11 ± 0.08	60 ± 2
Centre	6.96 ± 0.02	27.7 ± 0.2
Disc	10.89 ± 0.07	52 ± 1

Notes. The table presents the ratio of medians for ¹²CO(1-0)/¹³CO(1-0) (middle column) and ¹²CO(1-0)/C¹⁸O(1-0) (right column), along with their propagated statistical uncertainties, categorized by environment.

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