Scaling relations between L_jet and radio luminosity at 1.4 GHz. The 3 GHz VLA-COSMOS data are plotted as coloured circles using the relations of Falcke & Biermann (1999) for different inclination angles of the jet, from 0 (face-on – towards the observer) to 90 (edge-on) degrees. Lines show scaling relations from the literature: the red line presents data from Willott et al. (1999), the blue line data from Merloni & Heinz (2007), the black line data from Cavagnolo et al. (2010), the yellow line data from O’Sullivan et al. (2011), and the cyan line data from Daly et al. (2012).