[α/Fe] versus [Fe/H] abundance patterns for Mg, Al, Si, and O as predicted by model 4 (upper blue lines) responsible for the creation of the in situ stellar population and by stars from the inner disk (lower red lines) responsible for the creation of the accreted stellar population in the bulge. Lines are color-coded by the number of stars formed by the model, with the upper blue colorbar referring to the in situ population and the right red colorbar referring to the accreted population.