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Correlations between maximum scaled and transformed ECD length and (a) best hearing frequency range (y=6104.3x+6975.2; R2=0.547) and (b) mean best hearing (y=3311.3x+4000.8; R2=0.566). Frequency value estimates for Archaeopteryx lithographica and Odontopteryx toliapica are provisional, as damage precluded accurate measurement of the basicranial axis length scaling factor on both specimens.
