Positive equilibrium varying β
. The coordinates of the positive equilibrium points varying β2. In (a) we show the coordinates of the small equilibrium point , and in (b), of the big equilibrium point . The small root T<increases, while the big one T> decreases up to , at which T<= T<, and then f(T) = g(T) does not have positive solution. The scales of vertical and horizontal axes must be multiplied by the factors shown in the legends to obtain the actual values.