PACS (100 μm, 160 μm) and SPIRE 500 μm flux ratios of the radial profiles with S/N ≥ 5. As in Fig. 4, in the left and right panels, points are plotted by Hubble type with (red) circles corresponding to early types (T ≤ 0), (green) triangles to spirals (0 <T ≤ 0), and (blue) squares to late types (T> 6). In the middle panel, points are distinguished by O/H with (red) circles showing 12 + log (O/H)> 8.4, (green) triangles 8.0 <12 + log (O/H)≤ 8.4, and (blue) squares 12 + log (O/H)≤ 8.1. Filled symbols correspond to positions with normalized (to optical radius R_opt) radii within R/R_opt≤ 0.8, and open symbols to larger radii. The right panel shows DL07 best-fit models only. In all panels, MBB fits are shown with two values of emissivity index β: β = 1.0 (dotted line) and β = 2.0 (solid line). Temperatures are also labeled from T_dust = 15 K to T_dust = 40 K.