Differences in radial-velocity shifts between Fe I lines of different strengths in different spectral regions of integrated sunlight vs. shifts in medium-strong Fe I lines at λ520 nm. Each point represents one temporal snapshot during the N59 simulation. The spectra correspond to those of a full solar disk, as synthesized from a sequence of center-to-limb spectra, although the numerical values [m s⁻¹] refer to the small simulation area (for the actual Sun, divide by a factor of ∼150−200). The vertical scales differ among the frames. The fitted straight lines suggest the trends, but also indicate the limitation from finite simulation sequences.