Fig. 3. CAIs devoid of resolved excesses in ²⁶Mg that could be attributed to the decay of ²⁶Al.

Instead, ∆²⁶Mg* appears to be slightly heterogeneous even within a single grain. A line corresponding to ²⁶Al/²⁷Al = 5.2 × 10⁻⁵ is shown for reference. All errors are 2σ.