Estimated star formation rate as a function of projected radio size (measured lobe to lobe) for the 3CR galaxies (red circles) and quasars (blue squares). The dashed line indicates the value taken to differentiate between subgalactic (<30 kpc) and supergalactic (>30 kpc) radio sources, respectively. Arrows indicate star formation rate upper limits for objects with fewer than three Herschel detections.