Logistic curve in some initial conditions (initial populations), "N"0. The curve can be calculated by the following: :N=\frac{N_0 K e^{rt}}{K-N_0+N_0 e^{rt}} where, "N" is population (the vertical axis), "t" is time (the horizontal axis), "r" is intrinsic rate of natural increase, "K" is carrying capacity. "N"0 is the population when "t" = 0.