\[M_{\kappa,\mu}\left(x\right)=\sqrt{\frac{2\mu x}{X}}\*\left(\frac{4\mu^{2}x}{2%
\mu^{2}-\kappa x+\mu X}\right)^{\mu}\*\left(\frac{2(\mu-\kappa)}{X+x-2\kappa}%
\right)^{\kappa}\*e^{\frac{1}{2}X-\mu}\*\left(1+O\left(\frac{1}{\mu}\right)%
\right),\]