Notes. The best-fit values Δα/α and their statistical uncertainties are in units of parts-per-million (ppm). We note that the full results of this work, with systematic uncertainties included, are presented later in Sect. 4 (Table 3). The χ² per degree of freedom () and number of fitted velocity components (N_comp) in each model are also presented. The final row provides the weighted mean Δα/α and 1σ uncertainty for our work. Milaković et al. (2021) defined five regions, instead of the three used here and in Kotuš et al. (2017); the values reported below for Milaković et al. (2021) are representative only and combine their Table 2’s LFC values for regions I and II for our left region, and their regions III and IV for our central region, using the inverse of their total Δα/α uncertainties as weights.