G-band region in synthetic nonmagnetic CO ⁵BOLD N59 solar spectra. Top frame: intensity spectra at disk center μ = 1 (black), at μ = 0.41 (green), and close to limb μ = 0.09 (red), separately normalized to a very local continuum. Middle frame: spectral ratios relative to disk center for μ = 0.79 (blue) and μ = 0.41 (green). Bottom frame: range of temporal variability illustrated by spectral ratios between snapshot instances of the highest (5806 K) and lowest (5735 K) model temperatures; the same vertical scale as the middle frame is used.