Overdensity core sizes in comoving units (top panel) and physical units (bottom panel) as a function of overdensity redshifts estimated by the PPM. The solid black lines show the evolution with redshift of the comoving (top) and physical (bottom) core sizes that correspond to an angular aperture of 60 arcsec. Different colors and symbols refer to the different photometric redshift catalogs used to detect the overdensities, as illustrated in the legend.