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Fig. S1 A schematic representation of the three scenarios of genomic architecture from which results were generated.

Fig. S2 An example graphically illustrating the ‘time of speciation’ as defined in the Methods of the main text.

Fig. S3 Effective migration rates over time for nine combinations of gross migration rates (m) and the average, per-locus strength of divergent selection (s) for large populations (= 20 000).

Fig. S4 Effective migration rates over time for the same nine combinations of m and s as in Fig. S3 (Supporting information), but for small populations (= 1000).

Fig. S5 The dynamics of population divergence for four combinations of m and s and the three genomic architecture scenarios.

Fig. S6 The effects of initial divergence via a few strongly selected mutations on the subsequent dynamics of speciation.

Fig. S7 Effects of allopatry on speciation dynamics. Each column gives results from one simulation run.

Fig. S8 The effect of the mutation rate on the time required to reach a given level of divergence.

Fig. S9 Increasingly asymmetric selection makes speciation more difficult.

Fig. S10 Times to speciation in the BU2S model when all selection coefficients are a constant value (rather than being drawn from an exponential distribution) and selection is symmetric in (A) the linkage model and (B) the genome-only model.

Video S1 Example broad time-lapse view of the process of the buildup of de novo genome-wide divergence, as shown through the temporal dynamics of FST across the genome.

Video S2 A slowed down time-lapse view of the critical period of genome wide congealing from the same example as in Video S1.

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