Some examples of logistic curve. The curves were calculated from the equation :N=\frac{N_0 K e^{rt}}{K-N_0+N_0 e^{rt}} , where, "N" is population size, "t" is time, "r" is intrinsic rate of natural increase, "K" is carrying capacity. "N"0 is the value of "N" when "t" = 0. The value of "K" for all curves is 100. The value of each set ("r", "N"0) is (0.5, 150), (2, 50), (1, 25), and (1.5, 1) in order from the top.