185469.fig.001
Figure 1: Discrete values of the spatial displacements 𝑎 𝑚 ( 𝑞 ) for a mean value of the perturbation parameter 𝑞 = 𝑒 𝜀 𝜋 , 𝜀 = 1 , 𝑘 = 1 , and 𝑚 = 0 , 1 , 2 , .