Attenuation in the FUV band versus the atomic (top), molecular (middle), and total (bottom) gas mass surface density in units of M_⊙ pc^-2 for individual regions in galaxies (sample A). Each data point corresponds to a single pixel which has been detected at a 3-σ level from the FUV to the FIR. No selection has been applied on CO and HI data. Data points with a poor fit (χ² ≥ 2) have also been removed. At the bottom of each panel we display the number of selected pixels N and the Spearman correlation coefficient ρ. Finally, the median uncertainty on A_FUV computed by CIGALE is indicated in the bottom-right corner.