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Precision measurements of electron reconstruction, identification, andisolation efficiencies and photon identification efficiencies are presented.They use the full Run 2 data of $pp$ collisions at a centre-of-mass energy of13 TeV, corresponding to an integrated luminosity of 139 $\mathrm{fb}^{-1}$collected by the ATLAS experiment during the years 2015-2018. The measuredelectron identification efficiencies have uncertainties that are around 30%-50%smaller than the previous Run 2 results due to an improved methodology and theinclusion of more data. A better pile-up subtraction method leads to electronisolation efficiencies that are more independent of the amount of pile-upactivity. Updated photon identification efficiencies are also presented, usingthe full Run 2 data. When compared to the previous measurement, a 30%-40%smaller uncertainty is observed on the photon identification efficiencies,thanks to the increased amount of available data.

Electron and photon efficiencies in LHC Run 2 with the ATLAS experiment