Left: ⁷Li/⁶Li vs. ⁹Be/⁶Li data for CAI Hidalgo, as measured (lower-left corner) by M.-C. Liu et al. (2024), with a weighted mean ⁷Li/⁶Li = 8.0, and after our corrections for cosmogenic Li. The spots before GCR irradiation were consistent with a single value, the weighted mean ⁷Li/⁶Li = 17.0. Hidalgo is consistent with an initially chondritic ⁷Li/⁶Li = 12.0, raised to a uniform ⁷Li/⁶Li = 17.0 by evaporation and Rayleigh distillation in the nebula, with subsequent addition of cosmogenic Li on the meteoroid (totalling 50%–70% of Li), lowering ⁹Be/⁶Li and ⁷Li/⁶Li to 8.0. Right: ⁷Li/⁶Li vs. ⁹Be/⁶Li data for CAI Hidalgo, as measured (lower-left corner) by M.-C. Liu et al. (2024), and after their larger correction (small diamonds with horizontal and vertical error bars) for cosmogenic Li (totalling up to >90% of Li). These would not be consistent with a single value, which led M.-C. Liu et al. (2024) to infer an isochron with a nonzero slope ⁷Be/⁹Be = (2.0 ± 1.5) × 10⁻⁴. This slope is exactly what would result from overcorrecting the data. We reproduce (diamonds) their corrections (large crosses) for cosmogenic Li but find much larger uncertainties (large error ellipses). Even with their greater correction, the ⁷Li/⁶Li ratios before irradiation would be consistent with a single value (here the weighted mean ⁷Li/⁶Li ≈ 23.4). Data are taken from Table 6; see text for details. Error bars and error ellipses have been made 1σ. Note the difference in scale between the two plots.