$\Newextarrow{\xhookrightarrow}{10,10}{0x21AA}$
6.14
\begin{equation} \begin{gathered}\label{equation:fiberwise-localization} \xymatrix@R =50pt@C=50pt{ \operatorname{\mathcal{E}}\ar [d]^{U} \ar [r]^{F} & \operatorname{\mathcal{E}}' \ar [d]^{U'} \\ \operatorname{\mathcal{C}}\ar [r]^{\overline{F}} & \operatorname{\mathcal{C}}' } \end{gathered} \end{equation}