This example shows a pair of associated function plots. These
illlustrate the second-order response of a harmonic or control system.
The response equation is

The six curves are for damping factors, , of , , , , , and . The asymptotes and tangents are shown for and . In the latter overdamped case the magnitude response is close to the asymptotes, the phase response is not close to the tangents. When overdamped, a second-order system is essentially a combination of two separate first-order systems.