Fig 3. Power analysis of the ability of Q₃ to detect a signature of introgression from 15,000 simulated genes (σ² = 1).

Each cell reports the proportion of 100 simulated datasets where Q₃ was significantly different from 0 in the direction expected from the simulated history of introgression. Within each matrix, the x-axis is the time of introgression relative to speciation (larger values mean relatively more recent introgression), and the y-axis is the rate of introgression. There is one matrix for each of three times between speciation events, which determine the levels of ILS (decreasing from left to right, as the times increase). The greatest power comes in scenarios with little ILS, high rates of introgression, and recent introgression events.