The behavior of the coronary artery systems (2) and (3) with different time-varying delays and disturbance ω₂(t) = (0.09sin(4t),0.03sin(5t)): (a) time response of x₁,y_b1,y_d1,y_f1, (b) time response of x₂,y_b2,y_d2,y_f2, and (c) error state of e_b,e_d,e_f when 0 ≤ t ≤ 15.