Differential abundances (manually measured) of (A – B) as a function of Tc for elements with Z ≤ 30 (left panel) also adding the neutron-capture elements (right panel). The red triangles correspond to the molecule-based abundances of C, N, and O. The slope found is 1.56 ± 0.24 × 10−5 dex K−1 based on the fit to the elements with Z ≤ 30.
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