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tokens: The authors would like to thank the reviewer for drawing their attention to the recent work of Fivet et al. ( 2016 ) and suggesting the comparison. PJS acknowledges financial support from the Atomic Physics for Astrophysics Project (APAP) funded by the Science and Technology Facilities Council (STFC). The collision strength data, as a function of electron energy, for the lowest 15 levels of Co + and Co 2+ can be obtained in electronic format with full precision from the Centre de Données astronomiques de Strasbourg (CDS) data base.