Erratum to: Ionization and fragmentation of fluorene upon 250 keV proton impact Chandan Bagdia, Shubhadeep Biswas, Anuvab Mandal, Shamik Bhattacharjee and Lokesh C. Tribedi Eur. Phys. J. D, 75 3 (2021) 82 Published online: 05 March 2021 DOI: 10.1140/epjd/s10053-021-00073-z