+b <- function(t) 1/(1 + exp(0.2*t - 1)) # logistic
+layout(matrix(0:3, 2, byrow = TRUE))
+curve(b, 0, 50, xlab = "Time", ylab = "")
+mu <- 0.07
+segments(0, mu, 50, mu, lty = 2)
+legend("topright", c(expression(lambda), expression(mu)),
+ lty = 1:2, bty = "n")
+plot(rlineage(b, mu), show.tip.label = FALSE)
+title("Simulated with 'rlineage'")
+plot(rbdtree(b, mu), show.tip.label = FALSE)
+title("Simulated with 'rbdtree'")