Figure 19
![Figure 19](http://media.springernature.com/full/springer-static/image/art%3A10.1186%2Fs13662-015-0535-2/MediaObjects/13662_2015_535_Fig19_HTML.gif)
The phase plot of the states \(\pmb{x_{2}}\) , \(\pmb{y_{1}}\) , and \(\pmb{y_{2}}\) \(\pmb{x_{1}}\) , \(\pmb{x_{2}}\) , \(\pmb{y_{1}}\) , \(\pmb{y_{2}}\) for \(\pmb{\tau_{2}=12.3642>\tau _{2}^{*}=10.3472}\) and \(\pmb{\tau_{1*}=1.05\in(0, \tau_{10})}\) .