  \begin{equation}
    \gamma_2 : \quad
    \begin{bmatrix}
      0       & -1.8045  & -1.8044 \\
      2.2471  & 0        & -1.2107 \\
      2.2470  & -1.2105  & 0
    \end{bmatrix}
    \; ,
  \end{equation}
