Table 1.

Priors on model parameters

Parameter	Description	Distribution	Minimum	Maximum
Latitude	Latitude of Ω (°)	Uniform	25	39
Longitude	Longitude of Ω (°)	Uniform	−103	−74
Nanc	Ancestral population size before initiating expansion (number of individuals)	Log-uniform	103.3	105.0
Kmax	Maximum carrying capacity of a deme (number of individuals)	Log-uniform	103.3	105.0
m	Migration rate between neighboring demes (proportion of individuals migrating per generation)	Log-uniform	10−2.0	10−0.3

The same priors were used in both species.