Power density spectra of the luminosity fluctuations for stable disks in which the viscous stress scales only with the gas pressure. The models have flickering parameters of b₀ = 0.1, b₀ = 0.3, b₀ = 0.6, b₀ = 0.99 and b₀ = 2.0 shown with cyan, magenta, green, red and blue points, respectively. The mean viscosity parameter α₀ = 0.1, the mean accretion rate is ṁ = 0.33, and the black hole mass is 10   M_⊙.