\[\begin{bmatrix}w_{\mbox{\tiny I}}(0;a,q)&w_{\mbox{\tiny II}}(0;a,q)\\
w^{\prime}_{\mbox{\tiny I}}(0;a,q)&w^{\prime}_{\mbox{\tiny II}}(0;a,q)\end{%
bmatrix}=\begin{bmatrix}1&0\\
0&1\end{bmatrix}.\]