Approximate NLO parton distribution functions with theoretical uncertainties: MSHT20aNLO PDFsJ. McGowan, T. Cridge, L. A. Harland-Lang and R. S. ThorneEur. Phys. J. C, 83 3 (2023) 185DOI: https://doi.org/10.1140/epjc/s10052-023-11236-0