Cartoon illustrating the region covered by the spiral mask on the Σ_⋆, Σ_mol, and Σ_SFR maps of NGC 4535, and the nominal binning approach used in this paper. We consider uniform bins in galactocentric radius (assuming the inclination and PA from Lang et al. 2020); the blue-shaded ring illustrates one of these bins at R_gal = 3.5 kpc. The right panels show the radial profiles of the arm/interarm contrast (in log scale) for Σ_⋆, Σ_mol, and Σ_SFR.