$\Newextarrow{\xhookrightarrow}{10,10}{0x21AA}$
9.34
\begin{equation} \begin{gathered}\label{equation:uniqueness-of-fiberwise-cocompletion} \xymatrix@R =50pt@C=50pt{ \operatorname{\mathcal{E}}\ar [dr]_{ U } \ar [rr]^-{H'} & & \widehat{\operatorname{\mathcal{E}}}' \ar [dl]^{ \widehat{U}' } \\ & \operatorname{\mathcal{C}}& } \end{gathered} \end{equation}