Chemical abundance ratio distributions of the bulge field and Ter5 stars from dataset #1 (see Sect. 3.1). Left panels: [Si/Fe], [Ca/Fe], [Mg/Fe], [O/Fe], and the average [<Ca, Si, Mg, O>/Fe] (i.e. [α/Fe]) trends with [Fe/H] of the bulge field (grey dots) and Ter5 (red triangles) stars. The running LOWESS median curves at 95% confidence (thick green lines) and 1, 2, 3σ shaded regions are also plotted, together with the typical measurement error bars. Right panels: corresponding distributions of the differences with the LOWESS median curve values.