Inertial and capacitive time constants as measured in the three groups of subjects, showing no relation between them, in contrast with the relation between R and C observed in Fig. 3. When viewed in the context of the damping index Δ (=4t_L/t_C), however, the scatter of the data points is seen to be contained in the range of 0.1 < Δ < 10 (thin lines), with an average at approximately Δ = 2.5 (heavy line). Data points are associated with group (top) and sex (bottom).