Kiel diagram of the full sample (contours; satisfying the initial query restrictions in log g < 3, [Fe/H] < −1, (g − r)0 > 0.2, S/N > 20, and respective cuts in the parameter errors) and the subset of halo giants (dots; after removal of metallicity-dependent CMD features and further pruning the metal-rich and -poor tails above −1.3 and below −1.8 dex) used for our statistical purposes.
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