Fig. 3. Cylinder surface plots (for details, see Materials and methods) of eardrum directionality in the four lizard species Mabuya (A), Leiolepis (B), Ctenosaura (C) and Gekko (D). The normalized velocities (colour scale, in dB re 1 mm s^-1 Pa^-1) are plotted as a function of direction (x-axis, contralateral angles on the left and ipsilateral angles on the right) and frequency (y-axis). The right and left row of figures show line plots of velocity (y-axis, dB re 1 mm s^-1 Pa^-1) as a function of direction (x-axis) at three frequencies (1000, 2000 and 3000 Hz, arrows), corresponding to three horizontal lines in the cylinder surface plot. (E,F) Eardrum directionality after occluding one eardrum by a dome of Vaseline. E, Mabuya; F, Leiolepis.