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Above 80.5 GV the rigidity dependence of the cosmic ray Fe flux is identical to the rigidity dependence of the primary cosmic ray He, C, and O fluxes, with the Fe/O flux ratio being constant at 0.155±0.006. This shows that unexpectedly Fe and He, C, and O belong to the same class of primary cosmic rays which is different from the primary cosmic rays Ne, Mg, and Si class. © 2021 authors. Published by the American Physical Society.enjournal article10.1103/PhysRevLett.126.041104https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.126.041104