MATLAB simulated phase portraits of coexisting infinitely many attractors in the X1 − X2 plane for different initials-related system parameters (δ1, δ2, δ3, δ4). (a) Upper- and lower-asymmetric chaotic double-scroll attractors. (b) Upper- and lower-period-2 limit cycles. (c) Chaotic attractor with different topologies. (d) Period-2 and period-3 limit cycles. (e) Period-1 limit cycle and point attractor. (f) Unbounded orbit.