Posterior means of speciation/introgression times (⁠$×10−3$⁠) when the introgression event is assigned to a wrong branch. In (a) tree A-tree B, data were simulated using species tree A (fig. 4a), with introgression from species A to B, but are analyzed assuming tree B, with introgression assigned incorrectly to the parental branch ST (so that $τX>τT$⁠). In (b) tree B-tree A, data were simulated under tree B (fig. 4b) and analyzed assuming tree A, with introgression assigned to the daughter branch B (with $τX<τT$⁠). For each number of loci (⁠$L=250$⁠, 1,000, 4,000), 100 replicate datasets were generated and analyzed. These correspond to the A-B and B-A settings of figure 4e, where estimates of other parameters are shown.