“Main sequence” for our data defined by the stellar mass (M_⊙) and SSFR (yr⁻¹). Galaxies are distinguished by their morphological type and whether they are members of the Virgo cluster (top) or in the field (bottom). The thick blue line is the locus of the galaxy main sequence and the red line the locus of “non-star forming” galaxies as defined by Schiminovich et al. (2007). For comparison the dashed lines are linear fits to the late (Sc/Sd, Sm/Irr) and early types (E/S0) in Virgo (dash) and the field (dot-dash). The solid black line is the proposed fit to the data used by Eales et al. (2017).