Redshift distribution of q_24,obs (top panel) and q_FIR (bottom panel) for our 3 GHz sample (black dots). The subsample with radio excess is highlighted with green circles. The dash-dotted line (top panel) indicates the radio-excess threshold by Bonzini et al. (2013, B13), while the horizontal dashed line indicates the threshold in q_24,obs defined by Donley et al. (2005). The dashed line of the bottom panel indicates the threshold in the rest-frame q_FIR identified by Del Moro et al. (2013).