Figure 7

Direct photon spectra in Pb-Pb collisions at $\snn$=2.76 TeV and $\snn$=0.2 TeV , in both cases for the 20-40% centrality class. Both spectra reflect the data without the subtraction of a contribution from pQCD photons. In case of the ALICE data, the slope of the exponential shown in the figure was determined without the subtraction of a pQCD contribution, while in the PHENIX case, the slope was determined after subtracting a pQCD contribution. In PHENIX, the pQCD contribution was determined by parameterizing a direct photon measurement in pp collisions