Monthly Notices of the Royal Astronomical Society Monthly Notices of the Royal Astronomical Society, Oxford University Press (OUP): Policy P-Oxford Open Option A, 2021, 501 (1), pp.L60-L64. ⟨10.1093/mnrasl/slaa195⟩ Monthly Notices of the Royal Astronomical Society, 2021, 501 (1), pp.L60-L64. ⟨10.1093/mnrasl/slaa195⟩