Temporal evolution of the Doppler velocity (upper panel), the line width (centre panel) and (logarithm of) the χ² non-Gaussianity parameter (lower panel) resulting from Gaussian fits to the specific intensity profile I_λ(t) obtained from the base model − 193, for different wavelength resolutions. We consider samplings of 1.4 mÅ (solid curve), 4.2 mÅ (dotted curve) and 8.5 mÅ, leading to 48, 16 and 8 points along the spectral line, respectively. In order to show best the effects of the wavelength we fix the pixel size resolution to 0R and show the case of ray 1 with a viewing angle of 45° for the top panel and the case of ray 2 with a viewing angle of 0° for the middle and bottom panels. The normalisation values are the same as in Fig. 13.