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Fig. 2. Mean hearing thresholds of Cyprinus carpio (solid lines) under
laboratory conditions (baseline) and in the presence of the different ambient
noise types. Broken lines show the cepstrum-smoothed sound power spectra of
the corresponding noise types (Fig.
1 shows the absolute amplitude spectra). DR, Danube river; TS,
Triesting stream; BW, backwater; LN, Lake Neusiedl.