Left panel: relative continuum intensities (normalised by the continuum intensity observed at disk-centre) at various inclinations as functions of wavelength, as predicted by the 3D hydrodynamic model solar atmosphere, and as given by the observations of Neckel & Labs (1994). Right panel: absolute continuum intensity in the vicinity of the O I 777 nm triplet as a function of inclination, as predicted by the 3D hydrodynamic model solar atmosphere, and as given by the observations of Neckel & Labs (1994), put onto an absolute scale using the atlas of Neckel & Labs (1984).