Comparison between the predictions of our model using 3 different IMF for [O/Fe], [Mg/Fe], [Si/Fe], and [S/Fe] vs. [Fe/H] and the observations in the bulge. The observational data for the bulge are filled circles from MFR09 and FMR07, the open triangles from Lecureur et al. (2007), the filled triangles from Alves-Brito et al. (2010). The plus signs are the infrared results from Rich & Origlia (2005), the filled hexagons are the infrared results by Ryde et al. (2009), and the stars are the results for microlensed dwarf stars by Bensby et al. (2010).