Fig. 2. Stereo phase portraits of attractors. Each row depicts a model, front and side view, followed by an example from the study, front and side view. From top row to bottom row, point attractor  (A , B , I , J ), periodic attractor  (C , D , K , L ), torus attractor  (E , F , M , N ), and chaotic attractor  (G , H , O , P ).