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. 2013 Mar 27;8(3):e59464. doi: 10.1371/journal.pone.0059464

Figure 6. Amplitude and phase of a periodically driven weakly damped oscillator.

Figure 6

The amplitude (left) shows a resonance peak near the intrinsic frequency Inline graphic. Near the resonance the phase difference between the oscillator and the driver is changing by about 180° (right).