$\Newextarrow{\xhookrightarrow}{10,10}{0x21AA}$
9.16
\begin{equation} \begin{gathered}\label{equation:presentable-categorical-pullback} \xymatrix@R =50pt@C=50pt{ \operatorname{\mathcal{C}}_{\pm } \ar [r] \ar [d] & \operatorname{\mathcal{C}}_{-} \ar [d]^{F_{-} } \\ \operatorname{\mathcal{C}}_{+} \ar [r]^-{F_{+} } & \operatorname{\mathcal{C}}, } \end{gathered} \end{equation}