Extended Data Fig. 1: Data selection criteria.
From: Sub one per cent mass fractions of young stars in red massive galaxies
Selection of our BOSS galaxy sample as a function of velocity dispersion and redshift. The plot illustrates the number density in logarithmic scale of available BOSS spectra with SNR > 7 in the SDSS-r band and (g-i) > 2.35. We select BOSS galaxies with redshift \(0.35{\le }{{\rm{z}}}\le0.6\), and velocity dispersion between 220 and 340 km s\({}^{-1}\). Lowest density regions show individual galaxies with dark blue.
