Left: relative deviation of the spline-interpolated limb darkening predictions computed for a single snapshot of the 3D model for HD 189733 with reduced wavelength sampling of R = 10   000 (solid lines) and R = 5000 (dotted lines) from the full sampling with R = 20   000. Each set of resampled wavelengths is shown in either case, resulting in two or four choices, respectively. Right: relative deviation of the spline-interpolated limb darkening predictions computed for the first 10 snapshots of a time sequence with N_t = 20 (solid line) and deviation of the predictions computed for the first and last 10 snapshots of the same sequence (dotted line). All calculations are based on the 3D model of HD 189733.