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Five speciation models used for simulations in this study. a) Scenario I: a single species without population structure. b) Scenario II: speciation into two species, with cessation of gene flow. c) Scenario III: speciation into two species, with ongoing gene flow indicated by arrows. d) Scenario IV: speciation into five species, with cessation of gene flow. e) Scenario V: speciation into four species, with ongoing gene flow between adjacent species indicated by arrows.
