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Pb-Pb isochron diagrams of Pb isotope analyses of all four Gujba chondrules (C1, C2, C3, and C4). N = number of fractions. MSWD = mean square of weighted deviations. Regression parameters: slope = 4.3062 ± 0.011, intercept = 0.623380 ± 0.000094 (uncertainties are 95% confidence intervals).
