Comparison of the signal-selection efficiency for the RTS² method (solid line) and for the multiplicity method (dashed line = time window of 20 s, dotted line = time window of 5 s), as a function of the number of true signal neutrinos in the detected burst, for FAR = 1 century⁻¹, different background rates r = 0.01 − 0.1 s⁻¹, and different values of the signal shape parameter τ₂.