Power S​_p,1.38 GHz≥9 versus size for the CSOs and CSO candidates of the sample. Red symbols are the sources already observed at 4.98 GHz with the VLBA (core-jet blazars have been removed), and the blue symbols are the remaining objects. Stars indicate objects with known redshifts. When the redshift is unknown, the radio power and LS have been computed for z between 0.5 and 2. The solid lines represent how the power and size vary as a function of redshift.