Left panel: empirical model of the red sequence (black lines). At each redshift, the lines run from m∗−2 <m<m∗ + 2. Right panel: three model lines with galaxy colours and magnitudes overplotted from field PSZ2 G119.30-64.68 (zspec = 0.557), within 2 arcmin from the centre of the overdensity. For clarity, error bars are not shown on individual points, but these increase in size from lower-left to upper-right. The inset illustrates the statistical error on the colour measurement around the location of the red sequence at this redshift (offset from the z = 0.55 model for clarity).
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