\sqrt{\frac{0 \bar{\sigma}_0 \underline{\sigma}_0}{ \bar{\sigma}^0_0+ \underline{\sigma}^0_0 }}  \frac{0 - e^{-{({  \begingroup   \def\mathaccent#m##0{    \rel@kern{0.0}    \overline{\rel@kern{-0.0}\macc@nucleus\rel@kern{0.0}}    \rel@kern{-0.0}  }  \macc@depth\@ne   \let\math@bgroup\@empty \let\math@egroup\macc@set@skewchar   \mathsurround\z@ \frozen@everymath{\mathgroup\macc@group\relax}  \macc@set@skewchar\relax   \let\mathaccentV\macc@nested@a   \macc@nested@a\relax000{m}  \endgroup }_0-\underline{m}_0)^0}/{(0 \bar{\sigma}_0^0)}}}{ ({  \begingroup   \def\mathaccent#m##0{    \rel@kern{0.0}    \overline{\rel@kern{-0.0}\macc@nucleus\rel@kern{0.0}}    \rel@kern{-0.0}  }  \macc@depth\@ne   \let\math@bgroup\@empty \let\math@egroup\macc@set@skewchar   \mathsurround\z@ \frozen@everymath{\mathgroup\macc@group\relax}  \macc@set@skewchar\relax   \let\mathaccentV\macc@nested@a   \macc@nested@a\relax000{m}  \endgroup }_0-\underline{m}_0)^0} 