Erratum to: Search for dark matter produced in association with a leptonically decaying Z boson in proton–proton collisions at s=13Te. - Sirunyan, A. M.; Tumasyan, A.; Adam, W.; Bergauer, T.; Dragicevic, M.; Erö, J.; Valle, A. Escalante Del; Frühwirth, R.; Jeitler, M.; Krammer, N.; Lechner, L.; Liko, D.; et al. (European Physical Journal C -- Particles & Fields, 2021)