Top left: Resolved Kennicutt-Schmidt relation with varying α_CO. The thick solid gray line corresponds to the ODR fit in the middle panel of Fig. 7, using a metallicity-dependent α_CO^MaNGA. The dashed pink (yellow) line represents the fit to the data computed using a constant α_CO = 3.0 (4.3). The corresponding data points to each linear fit are only the unhatched pixels above the 4σ detection threshold. Bottom left: Residuals with respect to the results shown in Sec. 4, with α_CO^MaNGA. Right: Radial profiles of α_CO for the three prescriptions.