$\Newextarrow{\xhookrightarrow}{10,10}{0x21AA}$
5.5
\begin{equation} \begin{gathered}\label{equation:mapping-space-cartesian-diagram2} \xymatrix@R =50pt@C=50pt{ \{ X\} \times _{\operatorname{\mathcal{C}}} \operatorname{\mathcal{C}}_{/g} \ar [r] \ar [d] & \{ X\} \times _{\operatorname{\mathcal{C}}} \operatorname{\mathcal{C}}_{/Z} \ar [d]^-{\rho } \\ \{ \overline{X} \} \times _{\operatorname{\mathcal{D}}} \operatorname{\mathcal{D}}_{ / \overline{g} } \ar [r] & \{ \overline{X} \} \times _{\operatorname{\mathcal{D}}} \operatorname{\mathcal{D}}_{ / \overline{Z} }. } \end{gathered} \end{equation}