Spectral synthesis of Ca II, Mg II, and Si IV based on modified inversion atmospheres of two well-fitted pixels of Event A. Temperature peaks have been added at three log τ₅₀₀ heights (differentiated by colour) with various peak heights and base widths (differentiated by colour shades, increasingly darker for increasing width and/or decreasing peak height). Subfigure A (top two rows) shows the results for placing such enhancement of log τ₅₀₀-width 0.1–0.3 (from light to dark shade) somewhere between log τ₅₀₀ = −5.9 and −4.9. Subfigure B (bottom two rows) offers a similar display for spikes of log τ₅₀₀-width 0.05, 0.1, and 0.3 (from light to dark) at heights between log τ₅₀₀ = −4.1 and −3.1. The underlying observations are from different pixels for the two subfigures. Each subfigure has a similar format to Fig. 12, with the spectral panels showing the observations as black dotted profiles and synthesis output as coloured solid lines.