Effective yields as a function of baryonic mass for our galaxies (purple circles). For comparison, observational results reported by Lee et al. (2006, leftwards-pointing black triangles) and Garnett (2002, black octagons) are also included. The shaded areas denote the 16–84 percentiles (dark grey) and the light grey contour shows the 2.5–97.5 percentiles from observations of Tremonti et al. (2004). Additionally, we show the analytical model fitted by these authors Tremonti et al. (2004, dashed black line). Black stars show the location of systems that have experienced different levels of metal loss: 80, 60, and 40 percent.