Fig. 6

SBF colour–colour diagrams obtained from present measures (main annulus) and literature data. Symbols and models are the same as for Fig. 4. For consistency with other filters, the z-band SBF magnitudes given by Blakeslee et al. (2009) are transformed from the ABmag to the Vegamag system according to Sirianni et al. (2005) (See electronic version of the Journal for a colour version of the figure).
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