Theoretical FCS functions for two diffusive components in 3D with added noise. The first diffusion time si fixed at τ₁ = 50 μs. The second component, τ₂, varies from 50 μs to 4.8 ms. Each graph shows 11 correlation functions depicting the cases for mole fractions of the second component, f₂, from 0-1 in steps of 0.1.