Figure Information Scope: PWG PWG-EM (Electromagnetic probes) Energy 5.02 TeV System Pb-Pb Figure Group Direct photon R_gamma in PbPb 5.02TeV Figure Image Figure image (.eps) R_PCMMeasurement_0020_DoubleRatioTrueEffPurity_WithModels.eps Figure image (.pdf) R_PCMMeasurement_0020_DoubleRatioTrueEffPurity_WithModels.pdf Figure Caption Direct photon double ratios in PbPb 5.02TeV from PCM