Redshift distribution for the galaxies presented in this study of Cl0024. The upper panel shows the distribution of redshifts derived from the new determination (solid line) and the determination from Sánchez-Portal et al. (2015) (dashed line). The lower panel shows the distribution of the residuals between the old and the new redshift determination. This figure includes all the galaxies (tiers 1 to 3, and “no deblending” and “composite Hα, lines”).