Synthetic TR spectra averaged over the first period, calculated for T = 10⁴ K. The layout of this figure corresponds to Fig. 4. The parameters of each model are given in each panel. Red, orange, and green stand for a model with κ = 2, 3, and 5 during the second half-period, respectively. Full lines show the spectra with photoexcitation, while the dashed lines correspond to spectra without photoexcitation. Each spectrum is normalized with respect to the Si IV 1402.8 Å intensity. Original intensities (in arbitrary units) are shown in the right-hand side of each image.