Spatially-resolved molecular gas Schmidt relation (Σ_SFR versus Σ_H2) for all sample galaxies, where the diffuse background has been subtracted from the SFR tracers. The red line is the fit obtained by averaging N (power-law indices) and log A (star-formation efficiencies) from individual galaxies (Table 4). The solid black line shows the best-fit to the spatially-resolved data for all galaxies. A Kroupa IMF and a constant X(CO) factor = 2.0 × 10²⁰ cm⁻² (K km s⁻¹)⁻¹ have been assumed.