Intensity spectrum for a surface resolved starspot and μ = 1.0. Shown is the umbra (blue), represented by the spectrum for the central voxel of the spots surface, the penumbra (green), represented by a voxel at half of the spots radius from the center of the grid and the undisturbed surface (black), represented by a voxel at the far rim of the grid. The left panel shows several lines of a CO band spectrum, while the right panel shows a wavelength region including a Mg I doublet line.