Cumulative contribution of extragalactic DWDs to the SGWB as a function of redshift, using our default population synthesis model and the SFRD from Madau & Dickinson (2014). The black dots represent the integrated contribution over the complete frequency range, and the colored ones correspond to different specific frequency bands. The redshift marking the limit of the homogeneous isotropic Universe z = 0.05 is indicated as the vertical dashed gray line, as is z = 0.5.