SFR (top) and dust mass (bottom) as function of stellar mass derived by Rowlands et al. (2012). The star formation main sequence at z = 0.13 is plotted as a solid line, with the scatter shown as dotted lines (Speagle et al. 2014). The early-type galaxies within the main sequence are plotted as open symbols. Filled symbols which appear to be within the main sequence are galaxies at higher redshifts, for which the main-sequence is higher. The typical errors are shown as large crosses. The Spearman rank correlation coefficient for the M_d − M_* diagram is 0.5 with a very small probability (∼3 × 10⁻⁵, ∼4σ) of the null hypothesis (no correlation) being acceptable.