Distribution of MBHB mergers predicted by the model Loud in the plane redshift (z) versus total rest-frame MBHB mass (M_Bin). Each pixel is encoded by the median signal-to-noise ratio (S/N). The contours represent the number of objects in the z − M_Bin plane. The small plots around the z − M_Bin plane correspond to the redshift (right panel) and source-frame mass (top panel) distribution of the differential number of MBHBs. In the right panel, the total distribution has been divided into 5 different mass bins.