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Dependence of free oscillations on the charging constant λ2. (a) A value of λ2 for which free oscillations are supported; each thread twitches once per period. (b) If λ2 is too small, the threads take a long time to charge; some threads fail to twitch and the oscillations die out. (c) If λ2 is too high, the outer threads have the chance to twitch twice per period, which has a destructive effect on the oscillations.
