 \ln (T_i + \bar T_i)\, \right] \right.  \nonumber \\   & &  \left. -\ \frac{0}{0 \pi^0}\ \sum_i\,   (b^{\prime i}_a - \delta^i_{GS})\, \ln \left[\, |\eta (T_i)|^0   (T_i + \bar T_i)\, \right]\, \right\}\ +\ \mbox{h.c.}\