Fig. 6: Engel parameter dynamics.

V(t) (solid line) and K(t) (dotted line) of the dimensionally reduced model versus time t. As shown in the figure, the regression fit functions are given by V(t) = 77.61 − 0.83t and K(t) = 54.71 − 1.15t. The regression fits justify the first-order linearity approximations of V(t) and K(t) as functions of time t.