Violin plot showing the distribution of SFR and SFE (1/τ_dep) arm/interarm contrasts in logarithmic scale for all radial bins across the PHANGS targets. As opposed to Fig. 4, here the SFR contrast is calculated directly as the ratio of Hα, without applying any corrections to account for extinction. The equivalent violins following our nominal approach (those from Fig. 4) are shown as translucent in the background for reference; these include the calibration introduced in Sect. B to consider extinction effects. The long dashed line shows the median of the distribution in each case, while the short dashed lines display the 25^th and 75^th percentiles of the data, with labels indicating for reference the corresponding values on a linear scale.