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Fig. 6. Threshold-to-noise ratios for masked thresholds of (A) C. carpio (T/N-ratio = signal frequencyx0.0093+9.14, r=0.789, P<0.001) and (B) P. fluviatilis (T/N-ratio = signal frequency x0.0214+20.128, r=0.456, P<0.001). Colours indicate the T/N ratios for the respective habitats according to Fig. 1.