Figure 44

Difference in units of standard deviations between the measured TPC energy loss of a given track and the expected energy loss of an electron with TOF ($\pm 3 \sigma^\mathrm{TOF}_\mathrm{e}$) and TRD (90\% electron efficiency) electron identification. The distributions are shown for tracks with a momentum of 1.9--2.1\gevc within the TRD acceptance (6~layers in the TRD) in \ppb collisions at \sqrtsnn~=~5.02~TeV.
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