Nuclear modification factor ($R_{\text{pA}}$) of isolated prompt photon production in p-Pb collisions at $\snn=5.02$ and $8.16$ TeV shown together with a measurement by the ATLAS collaboration in p-Pb collisions at $\snn=8.16$ TeV . For illustration purposes, the data points at $\sqrt{s_{\text{NN}}}=5.02$ TeV are displaced by $\Delta p_{\rm T}=+300\text{MeV}/c$. The normalisation uncertainties are denoted as coloured boxes around unity.