Root mean square of the normalized continuum intensity as a function of the viewing angle. We show results for four different datasets. Black squares: continuum intensity maps derived from the STAGGER simulations (full spatial resolution); blue circles: synthetic data corresponding to a diffraction-limited instrument; red triangles: STAGGER data convolved with the PSF from Couvidat et al. (2016) with γ = 2.5; and green line: HMI data (along the equator, west of the central meridian). The error bars are smaller than the symbol size or the thickness of the line.