Figure A1.

Domain of validity of Equation A10 (white contours), as a function of the strength of migration (M) and mutation (θ), (A) n = 2, (B) n = 20. The dark shading represent the domains where the validity of Equation A10 is poor (i.e., the exact value of ${\lambda }_2^{\text{ln}\left(0.95\right)/\text{ln}\left({\lambda }_1\right)}>0.05$; from Equation 5).