Same as in Figure 6, but for the SIGW-DELTA (left panel) and SIGW-GAUSS (right panel) models. The solid and dashed teal contour lines labeled f PBH = 1 in the right panel indicate the PBH bound for Δ = 1 and Δ = 2, respectively. Figure 24 in Appendix C.2 shows extended versions of the two plots that include the SMBHB parameters A BHB and γ BHB.