Positive equilibrium values varying β
. The coordinates of the positive equilibrium points varying β1. In (a) we show the coordinates of the small equilibrium point , and in (b), of the big equilibrium point . The coordinates of is quite insensitive with variation in β1, and in (b) we also show the curves of T
( at ) and T
(Ā = 0 at ). The small root T<decreases very slowly, while the big one T> increases up to T> = T
, and then, decreases. The scales of vertical and horizontal axes must be multiplied by the factors shown in the legends to obtain the actual values.