Fig. 5. Velocities measured at 15 points on a line along the ossicular chain are plotted in the Gaussian plane (real-imaginary). The real and the imaginary parts of the velocity measured from the 15 points; three on the incus (open circles) and 12 on the malleus, are plotted for three different frequencies (150, 350 and 545 Hz). The points on both malleus and incus represent a reasonably straight line, which indicates that the measured points are located on structures (malleus and incus) that dynamically function as one unit.