Figure 1.

Two-phase model of population growth. An early period of constant size (Phase 1) is followed by a period of population growth (Phase 2). The dotted line reflects the time of onset of growth, during which the effective population size increases exponentially from ancestral to modern levels.

Russell et al. BMC Evolutionary Biology 2011 11:88   doi:10.1186/1471-2148-11-88
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