   & 0 \\           0               & 0               & \gamma(\omega)        \end{array} \right), \nonumber \\ %\label{eq.Mamp0} %\end{equation} %\begin{equation} \hat M(0,\omega) &= \left( \begin{array}{ccc}           \xi(\omega)     & -\delta(\omega) & 0 \\           -\delta(\omega) & \