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where the exponent is the sum of the intensities of migration and coalescence. In the simplest case of

(the example given in Hudson 1990) where time is scaled in units of the total population size 2Ned or the sum of number of lineages in all of the demes.

When an event does occur at a time given by this exponential distribution in equation 4.70, it is then necessary to decide whether the event is a coalescence or a migration. The total chance that the event is either a migration or a coalescence d k. (k. 1)

the event is a migration is

0 0

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