Model comparison of the temporal variation of the spectral line broadening. The line width (upper panels) and (logarithm of) the non-Gaussianity χ² parameter (lower panels) resulting from the Gaussian fits to the specific intensity I_λ(t) for the 0R pixel size case are presented. From left to right the first two panels correspond to rays 1 and 2 for the 0° angle case. The last two panels correspond to rays 1 and 2 for the 45° angle case. Different line styles denote the different models studied in this work, as indicated in the legend. The normalisation values are the time averages of the corresponding quantities for ray 1 and 0° viewing angle.