591058.fig.005
Figure 5: Comparison of the 1st, 2nd, and 5th-order HAM approximations of 𝜔 with the numerical results ( 𝛼 = 1 , 𝜃 = 0 . 9 9 9 9 3 9 , = 2 . 3 ). Symbols: Runge-Kutta numerical results; dotted line: 1st-order; dash-dotted line: 2nd-order; solid line: 5th-order.