Table 3 Maximal allowable upper bounds \(\lambda _{1}\) for different \(\tau _{1}\) and μ, when \(d=0.5\)

\(\tau _{1}=1.5\)

\(\tau _{1}=1.3\)

\(\tau _{1}=1.1\)

\(\tau _{1}=0.9\)

\(\tau _{1}=0.7\)

\(\tau _{1}=0.5\)