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Fig. 7. Results of two methods for characterizing tuning properties of Knollenorgan
electroreceptors. Frequency responses are shown for a single Knollenorgan in
either type I (A; specimen 3) or type II (B; specimen 5). Red plots show
threshold tuning curves. Black plots show magnitude spectra of revcor filters
(computed for the same units; plotted upside down; not smoothed in these
cases). Each spectrum is aligned vertically to the corresponding tuning curve
for comparison.