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Ahhh... ok. Thanks a lot.

I would like to have on the RHS a } parenthesis with numbering of the following equations (load amsmath package):

\begin{align} \label{diffeq2}
\begin{split}
\frac{\partial A_{1}(z)}{\partial z}= i c A_{D}(z) \, , \vspace{2mm} \\
\frac{\partial A_{D}(z)}{\partial z}= i c A_{1}(z) + i c A_{2}(z ...