Comparison of the GCR iron flux between models and measurements: (a) 2010 January, (b) 2014 February, and (c) 2019 October, compared to the ACE/CRIS measurements (deep-blue scattered points), and (d) 8.5 yr averaged iron flux multiplied by E ^2.7, compared to the AMS-02 measurements (light-blue scattered points). In each of these four panels, the purple, magenta, yellow, orange, and red curves denote the iron flux of the DLR, BON20, SDEMMA, HelMod, and CRÈME models, respectively. Two additional panels provide the statistical evolution of the flux compared to the ACE/CRIS measurements: (d) absolute relative difference (﹩\left|{RD}\right|﹩) between the model predictions and measurements and (e) ﹩{\chi }_{\nu }^{2}﹩ value.