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Probability 
of gene tree 
, plotted (a) as a function of population divergence in coalescent units (
) in a pure isolation model for two populations without gene flow and (b) as a function of population divergence in coalescent units (
) and scaled migration rate 
. According to Jackson et al. (2017), the lower and upper limits of 
for species delimitation are 0.47 and 0.8.
