Simulated stellar disks and their profiles. Top: four resolved NESSI disk brightness temperature maps based on the provided Doppler imaging map with distinct umbra, penumbra, and quiet Sun regions as well as applied limb darkening. From left to right, the phases are 0, 0.25, 0.5, and 0.75. Bottom: resulting spectra for Ca II K and K I 7699 A for all phases (colored) and the disk with no spots (black). The red dashed lines denote the rest wavelength of the line.