Fig. 9.

(A) Phase-plane diagram in steady state at $P_{pl,v}=15$ mmHg and (B, C) instantaneous equilibrium point for $J_v$ and J_q. Arrows in A and B represent the trajectories for V_isf and Q_isf. $J_v$ and J_q were multiplied by 3.0 × 10³ and 6.0 × 10⁴, respectively, to visualize vectors in the diagram in A. Red and blue circles in A, Ba, and Bb indicate V_isf and Q_isf values obtained when $P_{pl,v}$ was switched back to 15 mmHg from 17 mmHg and 13 mmHg, respectively. Green circles in panels A, Ba, and Bb indicate values obtained at steady state at $P_{pl,v}=15$ mmHg. Red, green, and blue squares indicate equilibrium points, to which the circles with corresponding colours tended to approach at a given time.