Combination of a CSP SED for an instantaneously formed stellar population of age 100 Myr and solar metallicity with AGN PLs for different values of α and fractional contribution x_AGN to the monochromatic flux at λ₀ = 4020 Å (black dashed line). Black lines represent purely stellar SEDs and blue, green, yellow, and red lines represent active galaxy SEDs with α = 0.5, 1, 1.5, and 2 for x_AGN = 0.4 (top panel) and x_AGN = 0.2, 0.4, 0.6, and 0.8 for α = 1.5 (bottom panel), respectively.