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Gene birth (β) and death (δ) rate estimates obtained for the foreground and background species in 410 BRhigh10 simulations of Exp. 2.2 (see text and table 1 for details), in which significant rate differences among species were detected. Red lines mark the expected (simulated) value 0.02 (β = δ of background species and β of foreground species) and the blue line marks the expected value 0.2 (δ of the foreground species).
