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Plots of (a) ε56Fe versus ε196Pt and (b) ε58Fe versus ε196Pt measured in IAB iron meteorites along with galactic cosmic ray model results, which represent meteoroids with radii spanning 5–120 cm, a cosmic ray exposure age of 1000 Ma, and an Ni/Fe ratio of 0.074 (Wasson and Kallemeyn 2002). The gray band represents the analytical resolution for εiFe, based on data for terrestrial samples. Data for ε196Pt are from Hunt et al. (2018).
