Results of the Monte Carlo experiments (see Sect. 2.2 for more details). The top panel a displays the distribution of the detection gain obtained by performing a sub-banded search over a full-band search (Experiment 1), both for the PMB (violet, search parameters a = 2 and Z = 2) and UWL (coral, search parameters a = 2, Z = 6) receivers. The dashed vertical lines represent the distribution percentiles at 16, 50, and 84%. The bottom panel b illustrates the sub-banded search detection gain as a function of the burst bandwidth occupancy (Experiment 2). The colour code and the sub-banded search parameters are the same as the top panel.