Figure 3
From: Analytical approximations for the amplitude and period of a relaxation oscillator
Limit cycle from analytical expressions (circles) and numerical calculations (triangles) are displayed in three dimensions. Parameter values are from Table 1. Points are spaced at 200 equal time increments along the trajectory, and colors of points represent time progression in ROYGBIV order. The total period is 27.4 hr from the numerical ODE solution and 32.0 hr from the analytical expression.