Top left and right panels: large and small frequency separations of the final inferred models of α Cen A and B, for the various asteroseismic calibrations. Symbols are the same as those used in Fig. 1, except for the red cross and dashed line, which represent respectively the observed values and their 1σ error box, that we derived from the pulsation frequency analysis made by de Meulenaer et al. (2010). Bottom panels: Hertzsprung-Russell diagram for the results of the different calibrations compared to the observational values of K17. The A and B components are depicted respectively in the left and right panels. The legend details are the same as in the top panels.