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\begin{document}



\begin{center}
\xymatrix{ H \ar @{>>} @< 2pt> [r]
 &  H\cdot 1=  {_H}{I }{_Q} \supset 1\cdot Q 
 & \ar [l]^-\cong_{.} ^-\epsilon
 & Q\ar[dddd, \rightarrowtail]\\
& \hspace*{3cm} \parallel  & & \\
&\hspace*{3cm} \tilde{E}(R) & &\\
&\hspace*{3cm} \cup & &\\
&\hspace*{3cm}  R & = & R}
\end{center}



\end{document}