The SWAN view of dense gas in the Whirlpool - A cloud-scale comparison of N2H+, HCO+, HNC, and HCN emission in M51

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Table C.1.

Fitting CO line ratios (LR) as function of Σ_mol when excluding central apertures of varying sizes

Cen. aperture [kpc]	LR	slope	slope err	ρ_Sp
0.0	N₂H⁺/CO	0.51	0.05	0.18
0.0	HCN/CO	0.07	0.03	0.29
0.0	HNC/CO	0.21	0.03	0.29
0.0	HCO⁺/CO	0.28	0.02	0.35

0.25	N₂H⁺/CO	0.56	0.05	0.18
0.25	HCN/CO	0.2	0.02	0.30
0.25	HNC/CO	0.33	0.02	0.301
0.25	HCO⁺/CO	0.35	0.01	0.36

0.5	N₂H⁺/CO	0.62	0.05	0.18
0.5	HCN/CO	0.26	0.02	0.31
0.5	HNC/CO	0.38	0.02	0.32
0.5	HCO⁺/CO	0.38	0.01	0.37

0.75	N₂H⁺/CO	0.69	0.05	0.16
0.75	HCN/CO	0.33	0.02	0.27
0.75	HNC/CO	0.46	0.02	0.29
0.75	HCO⁺/CO	0.41	0.02	0.35

1.0	N₂H⁺/CO	0.68	0.06	0.15
1.0	HCN/CO	0.36	0.02	0.20
1.0	HNC/CO	0.51	0.02	0.25
1.0	HCO⁺/CO	0.43	0.02	0.33

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