Dust masses (top), TIR luminosities (bottom) for the DGS (crosses), and KINGFISH (downward triangles) samples as a function of metallicity, colour coded with M_star. The best power-law fit is indicated with a black line, and the 1σ dispersion is indicated with dotted lines for the two panels. The distribution of each parameter is indicated on the side of each panel for both samples: solid line for DGS and dashed line for KINGFISH.