Comparison between the calculated isotopic compositions of simulated analogs and the published isotopic data. The isotopic compositions of the analogs of Earth, Mars, and main-belt asteroids are calculated using Eq. (4). The parameters c₁ and c₂ are chosen for the best match between the calculated isotopic compositions of the asteroid analogs (blue, red, and purple curves) and the published isotopic data for NC meteorite parent bodies (blue shaded area). The best match has the largest p in the Kolmogorov–Smirnov test. All uncertainties are 2σ except for the uncertainties of the published ε⁵⁴Cr data, which are shown as 2se.