Spectral energy distribution as a function of wavelength for a model with input parameters M = 1 M_⊙, L = 5000 L_⊙, T_∗ = 2800 K, u_p = 4 km s^-1, and log n_gr/n_H = 14.5. The original spectrum is shown in black and the coloured curves show spectra calculated without TiO opacities (red) and H₂O opacities (blue), indicating which photometric bands will be affected by changes in the corresponding features.