Top panels: Pseudorapidity distribution of inclusive photons measured within 2.3 $<$ $\eta_{\rm lab}$ $<$ 3.9 in pp (a), p$-$Pb (b), and Pb$-$p (c) collisions at $\sqrt{s_{\rm NN}}=5.02$ TeV. Results from various MC predictions are superimposed. Bottom panels: The ratios between MC results and data are shown. Shaded boxes represent the systematic uncertainties.