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. 2013 Nov 6;10(88):20130643. doi: 10.1098/rsif.2013.0643

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© 2013 The Authors. Published by the Royal Society under the terms of the Creative Commons Attribution License http://creativecommons.org/licenses/by/3.0/, which permits unrestricted use, provided the original author and source are credited.

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Figure 6. — (a) Full numerical spectrum and (b) typical time series corresponding to the stochastic switching between the annual and triennial cycles in the seasonally forced model. Parameters: N = 10⁶, μ = 0.02 1 y⁻¹, R₀ = 11, 1/ν = 15 days, ε = 0.1. The dashed line in (a) indicates the frequency corresponding to the period 3 years. (Online version in colour.)