GCE model predictions compared to Case 1+2, which is based on ECSN yields from S. Wanajo in the top panel a). The predictions are in the middle panel b) compared to Case 3+4 which is neutrino-driven winds from Arcones & Montes, and in the bottom panel c) the comparison is made to Case 5+6, namely fast-rotating stars from U. Frischknecht. The dashed/solid lines represent the upper/lower limits to the Sr yields, respectively.