Evolving sSFR−z relations for the Expdelc parametric form. Solid and dotted curves are the sSFR−z relations for the four mass bins (colour coded as in Fig. 16) for BC03 and MS11 models, respectively. Blue, black, green, cyan and red open circles (and violet open triangle) are the sSFR estimates obtained by various authors at different redshifts (for the four mass bins), as indicated in the top left of the figure. The grey horizontal dashed-dotted line marks the level of sSFR at which a galaxy is in general considered completely quiescent (sSFR ≲ 10^-11 yr^-1). Dark-grey and light-grey shaded regions represent the uncertainty on the look-back time, associated with the results from BC03 and MS11 models, respectively.