Fig. 5
Probability distributions of Q-values, hns(Q), for different numbers of injected signal events, ns. Black: background only, h0(Q); red, green, blue ... : ns = 1,2,3... injected signal events. Grey vertical lines indicate the threshold values 
for different significances after accounting for a trial factor of 296 (see Sect. 8) as calculated from h0(Q). This example shows GRB 110918 with Λ > − 5.5 and μb = 3.7 × 10-4 background events.
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