Fraction of late-type galaxies as a function of redshift (top panel) and stellar mass at z ~ 0 (bottom panel). The redshift data points are from Buitrago et al. (2013), and the stellar mass ones from Bernardi et al. (2010) in the SDSS. The line in both panels is the best least-squares linear fit to the data. (A colour version of this plot is available at the electronic edition)