The same as Figure 1 except for variations in the metallicity-specific SFRD instead of binary physics. The panels show the fiducial metallicity-specific SFRD model (red), a variation assuming the L. Strolger et al. (2004) SFRD, the M. Furlong et al. (2015) GSMF, and the X. Ma et al. (2016) MZR (green), as well as a variation assuming a P. Madau & T. Fragos (2017) SFRD, the B. Panter et al. (2004) GSMF, and the N. Langer & C. A. Norman (2006) with an offset MZR.