Fig. 2

Plot of \(f_{E}(\kappa \tau , \nu )\) of (7) on the plane of (\(\kappa \tau\), \(\nu\)). Compared to Fig.  1, the ranges of \(\kappa \tau\) and \(\nu\) in this figure are [0.2050, 0.2150] and [0.0200, 0.0300], respectively, and they can be used to obtain precise values of system parameters to minimize the quantitative measure \(f_{E}\)