Resonant frequency curves for the LPs.

<p>The relationship between resonant frequency and load is shown for each of the LPs. Circles are mean frequencies measured empirically during free vibration, and the solid line indicates resonant frequencies predicted by the mass-spring-damper model. Two standard errors of each model approximates 95% confidence intervals and is indicated by the gray shaded region. Standard deviations of the empirical means are also shown by the error bars of individual data points. Note, much of this error is too small to be visible at the scale of these plots. (a) Pole C (b) Pole D (c) Pole E (d) Pole F.