(一)骨干曲线(厚的实线)为不同的值γ,贴上标签;轨迹点C,即。,relative minima, (thin solid line) and points D, i.e., relative maxima, (thin dash-dotted line). (b) Frequency corresponding to the relative minima (solid line) and maxima (dash-dotted line) as a function of  γ。(c)位移振幅对应的相对最小值(实线)和最大值(dash-dotted线)的函数γ。垂直虚线(b)和(c)表示的渐近的趋势 ,和圆表示的极限 。