Exploring He II λ1640 emission line properties at z ∼ 2−4 (Corrigendum) Themiya Nanayakkara, Jarle Brinchmann, Leindert Boogaard, Rychard Bouwens, Sebastiano Cantalupo, Anna Feltre, Wolfram Kollatschny, Raffaella Anna Marino, Michael Maseda, Jorryt Matthee et al. (3 more) A&A, 648 (2021) C2 Published online: 19 April 2021 DOI: 10.1051/0004-6361/201834565e