Isolated photon differential cross section compared to JETPHOX and NLO theory from Werner Vogelsang as a function of p_T measured in p-Pb collisions at sqrt(s) = 5.02 TeV. Error bars are statistical and boxes are systematic uncertainties. The green band represents JETPHOX scale uncertainty. The JETPHOX predictions were calculated using NNPDF40 for the proton, nNNPDF30 for the lead nucleus, and BFG II fragmentation function.The blue band represents NLO theory scale uncertainty. The NLO theory predictions were calculated using CT18 for the proton, nCTEQ15 for the lead nucleus, and GRV fragmentation function.