Dust temperatures plotted against τ₁₆₀ for the 250 pc regions within the target galaxies: in the left panel best-fit T_cool and in the right panel effective temperature T_dust. The medians binned in log₁₀(τ₁₆₀) are shown as heavy lines characterized by different colors, with the 1σ variation by shaded regions. The horizontal dashed lines correspond to the overall T_cool galaxy medians (left panel) and T_dust (right). Only in the case of NGC 5253 does the effective temperature T_dust present a trend with τ₁₆₀, in the sense that more optically thick regions show higher temperatures.