S/N distributions (binned with an S/N bin size of 1) of the candidates: in grey, those initially detected by HEIMDALL; in coral, the HEIMDALL candidates filtered according to the criteria listed in Eq. (5); in purple, the filtered candidates positively classified by FETCH; in magenta, the sample of our 51 detections along with the 10 previously discovered FRBs in this survey (Thornton et al. 2013; Champion et al. 2016; Petroff et al. 2019, including detections in multiple sub-bands); and in blue, the same distribution as the magenta one, but with the sample of our detections limited to events with S/N ≥ 10 (see Sect. 4.2 for more details).