Publisher Erratum: Approximate $$\hbox {N}^{3}\hbox {LO}$$ parton distribution functions with theoretical uncertainties: $$\hbox {MSHT20aN}^{3}\hbox {LO}$$ PDFs
J. McGowan (Department of Physics and Astronomy, University College London, London, WC1E 6BT, UK); T. Cridge (Department of Physics and Astronomy, University College London, London, WC1E 6BT, UK); L. Harland-Lang (Rudolf Peierls Centre, Beecroft Building, Parks Road, Oxford, OX1 3PU, UK); R. Thorne (Department of Physics and Astronomy, University College London, London, WC1E 6BT, UK)