Illustration of the CLF bin limits. Measurements for individual clusters are represented by the grey error bars. Bin delimitations are indicated by the red dashed lines. Top panel: richness in 0.5 Mpc as a function of redshift, with a minimum richness of 6. The black dots indicate the median values of the richness in each redshift bin. Bottom panel: redshift as a function of the richness in 0.5 Mpc, with a maximum redshift of 0.67. The black dots indicate the median redshift value in each richness bin.