\[w_{2}(a,x)=xe^{-\frac{1}{4}ix^{2}}M\left(\tfrac{3}{4}-\tfrac{1}{2}ia,\tfrac{3}%
{2},\tfrac{1}{2}ix^{2}\right)=xe^{\frac{1}{4}ix^{2}}M\left(\tfrac{3}{4}+\tfrac%
{1}{2}ia,\tfrac{3}{2},-\tfrac{1}{2}ix^{2}\right).\]