Closure phases of models with modified inner rim for the active state with an inclination of 45° as a function of stellar luminosity and the corresponding sublimation radius for the H, K, L, M, and N bands (solid; left axis). The corresponding fluxes in the photometric V and N bands are also shown (dashed; right axis). The V- and N-band fluxes are normalized with respect to the reference model with L = L₀. The stellar luminosity of each model is increased such that the sublimation radius matches the given R_in (see Sect. 3.3 for details).