Solar linear limb-darkening coefficients as a function of wavelength. Black points, joined by a dashed line to guide the eye, show the equivalent linear coefficients (ELCs) calculated from the observations of Neckel & Labs (1994). Blue points, joined by a solid blue line, show the ELCs calculated from the 3D STAGGER solar model (Magic et al. 2015) in each of the 38 wavelength channels of PAVO. Triangles show linear coefficients calculated by Claret & Bloemen (2011) from 1D ATLAS models in Cousins R and I bands. They used two different methods, flux-conserving (FC) and least-squares (LS) fits to the models, indicated by upward orange triangles and downward pink triangles, respectively. Green squares show the linear coefficients calculated using a LS fit from the STAGGER model in Johnson R and I bands by Magic et al. (2015). The error bars show the full width at half maximum of the respective bandpasses. See text for a discussion of the different methods of determining the coefficients.