Fig. B.1.

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Bulge Sérsic index as a function of the total galaxy stellar mass M*. The red points show the individual galaxies, while the red stars show the binned median, with the error bars marking the 16th-84th percentile range. For statistically significant mass bins of M* > 1010 M⊙, the Sérsic index of the bulge increases with increasing galaxy mass, which arises from the bulge assembling from the discs. The timescale of assembly is expected to be shorter for the more massive galaxies, and longer for the less massive ones, which is consistent with our results on downsizing seen in low-redshift spiral galaxies.
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