Localization performance as a function frequency.

<p>Higher values denote higher entropy and lower localization performance. (a) The performance of the model for different signal to noise ratios as a function of frequency for a medium noise level averaged across the frontal hemisphere (see <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0020627#s4" target="_blank">Methods</a> section). (b) The performance as a function of frequency averaged across the signal to noise ratios for three levels of noise and a model in which the emission pattern was replaced by that of two isotropic sound sources. (c) The difference between the azimuth-elevation position for which performance is the worst and the best as function of frequency. This plot shows that, at around 80 kHz, the range in localization performance across the frontal hemisphere is the largest. Moreover, the range in performance across locations in the frontal hemisphere is reduced by replacing the emission pattern of <i>R. rouxi</i> by that of two isotropic sources. The yellow regions are 95% confidence ranges for the fundamental and 1 overtone in the call of <i>R. rouxi</i> as estimated from the data provided in ref. <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0020627#pone.0020627-Neuweiler1" target="_blank">[8]</a>.