PlanetPhysics/Cubic Diagram

Cubic diagram
$$ (1) \begin{matrix} \xymatrix@R=2pc@C=2pc@L=0pt{ A \ar[rr]^*+{f} \ar[dr]^(0.6)*+{\phi^0} \ar[dd]_*+{i} && B \ar[dr]^*+{\phi^2} \ar[dd]|\hole^(0.75)*+{\bar{i}} & \\ & C \ar[dd]_(0.25)*+{j} \ar[rr]^(0.25)*+{g} && D \ar[dd]^*+{\bar{j}} \\ X \ar[rr]|\hole_(0.7)*+{\bar{f}} \ar[dr]_*+{\phi^1} && Q \ar[dr]^(0.35)*+{\phi} & \\ & Y \ar[rr]_*+{\bar{g}} & & R } \end{matrix} \tag{7.5.6} $$