Figure 5

 Upper limits of direct photon production at 90\% C.L. together with the invariant inclusive photon cross section at 2.76 and 8 TeV including pQCD NLO predictions with CT10~, nCTEQ15~ or CTEQ6.1M~ proton PDF and GRV~ or BFG2~ FF In addition, a JETPHOX calculation~ based on NNPDF2.3QED~ proton PDF and BFG2 FF as well as a POWHEG~ calculation based on the same PDF but with the PYTHIA 8 parton shower algorithm are provided Upper limits are calculated for all spectrum points where the $\Rg$ value including its total uncertainty is consistent with unity and indicated by the horizontal bars at the end of the arrows in the figure Furthermore, direct photon cross sections are given where $\Rg$ is larger than unity considering only statistical uncertainties (round markers and vertical error bars) or taking only systematic uncertainties into account (boxes)