Rest-frame 1.4 GHz luminosity vs. linear size for the ATESP early-type galaxy sample. Asterisks represent sources with resolved sizes, while downward triangles represent upper limits. The quality of the model fit is colour-coded: blue for JP fits, red for power-law fits, black for uncertain fits (all PL marked with a question mark in Table 4) and green for sources that did not permit fitting. The 5 reliably variable sources are inside squares.