Let us assume that all those masses comprise a rigid entity m eff that oscillates as a whole and in phase with the air in the ear canal. In other words, the masses of which m eff is composed do not oscillate separately and out of phase with the air. The angle will be used to calculate R a from tympanographically meaasured G a and B a . . A together with oscillating mass m can be fitted to the resonance frequency f r . Heavy curves represent mass reactances , light curves compliant reactances .
Curve parameter is the ear canal pressure p .
Detail of Fig. Detail of Fig. Graphical explanation of shapes of curves in Figs. Division of both sides with U yields . The circle has been drawn to emphasize non-circular form of curve.