\[W\left(\tfrac{1}{2}\mu^{2},\mu t\sqrt{2}\right)\sim\frac{l(\mu)e^{\mu^{2}\eta}%
}{2^{\frac{1}{2}}e^{\frac{1}{4}\pi\mu^{2}}(1-t^{2})^{\frac{1}{4}}}\*\sum_{s=0}%
^{\infty}(-1)^{s}\frac{\widetilde{\cal{A}}_{s}(t)}{\mu^{2s}},\]