Top: total stellar mass of potential GC systems plotted against their parent halo mass. Pale dots indicate sub-samples defined using observable properties of present day GCs. Stars and triangles represent the f_b = 1 and f_* = 1 samples, respectively. Two of the relations plotted are taken from Spitler & Forbes (2009; solid) and Harris et al. (2017; dash). The yellow line is the relation we find for our simulated data. Bottom: same as top plot except the turquoise squares are the GC systems examined in Forbes et al. (2018a).