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Bayesian skyline plot representing historical demographic trends in: (a) Pelasgus marathonicus, and (b) P. stymphalicus. The course of the graph illustrates fluctuation of the population size from recent to the coalescence (left to the right). Time on the x-axis in million years ago. Y-axis shows effective population size × generation time; in logarithmic scale. Solid middle line shows the median estimate and the blue shaded area represents 95% highest probability density limits.
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