Fig. 4: Demographic models explored by ∂a∂i analysis to test different hypotheses for gcx1 origin.

1 gcx1-GM originated from admixture between CO and GA (‘admix_origin_no_mig’ model); 2 gcx1-GM split simultaneously from CO and GA (‘sim_split_nomig’ model), the best supported model depicted by the analysis; 3 gcx1-GM stemmed from GA (3a) or CO (3b) (‘split_nomig’ model).