Absolute stability region
Stable region in red.

Coefficients

\begin{align} \begin{array}{c|ccccc} & & & & & \\ 0.225 & 0.225 & & & & \\ 0.595 & 0.051 & 0.544 & & & \\ 0.577 & 0.051 & 0.381 & 0.145 & & \\ 0.845 & 0.051 & 0.381 & -0.373 & 0.787 & \\ \hline & 0.051 & 0.381 & -0.373 & 0.593 & 0.349 \end{array}\end{align}

Properties