Comparison between our abundance patterns and previous ones in the literature (Edvardsson 1988; Neuforge-Verheecke & Magain 1997; Luck 2018; Allende Prieto et al. 2004; Gilli et al. 2006; Porto de Mello et al. 2008; Bruntt et al. 2010; Jofré et al. 2015). For elementswith abundances corresponding to two ionisation stages, we followed the procedure outlined in Sect. 5.2. The results are shown as a function of T_c (Lodders 2003). For each study, the metal abundances of α Cen A and B relative to hydrogen, [X/H], are shown in the top and middle panels, respectively. A dashed line is drawn at [Fe/H]. Bottom panel: abundance differences, Δ [X/H], between α Cen A and B. To guide the eye, a dashed line is drawn at Δ[X/H] = 0. The dotted line indicates the mean difference, while the grey strip shows the corresponding 1σ uncertainties. For Edvardsson (1988), Porto de Mello et al. (2008) and our study, the uncertainties for elements other than iron refer to [X/Fe], not [X/H]. However, they are expected to be representative.