Intensity with respect to the R_max of our model for simple MARCS (orange), (red), 10⁻⁵ (green), 10⁻⁶ (blue), and 10⁻⁷ M_⊙ yr⁻¹ (purple) and the different wavelength cuts corresponding to the following: the continuum (2.26 µm < λ < 2.28 µm, upper left), the transition CO (2–0), (λ = 2.29 µm, upper right), water (1.9 µm < λ < 2.1 µm, lower left), and SiO (λ = 4.0 µm, lower right). We observe an extension in all cases except for the MARCS model without the addition of a wind.