Fig. 6

Predicted detection probabilities over distance for high transmitting power at median noise conditions for an hourly (upper) and daily (lower) resolution, as calculated with different numbers of detectable transmissions n (Table 5). The intersection of the curves with a probability of 0.5 (white line) indicates the D₅₀. The intersection of the curves of π and P was a result of setting the detection threshold k at 2, whereas π and P at k = 1 would never intersect (Fig. 1)