Erratum to: Radiological protection requirements with regard to cosmic-ray exposure during air travelCebastien Joel Guembou Shouop, Maurice Ndontchueng Moyo, Eric Jilbert Nguelem Mekongtso, Kunwoo Cho and David StrivayEur. Phys. J. Plus, 136 4 (2021) 391DOI: https://doi.org/10.1140/epjp/s13360-021-01401-3