Evolution of the electron temperature (top row) and density (bottom row) profiles with time for the simulations with the models (a) m₁, (b) m₂, and (c) m₃ (L= 0.5, 1 and 3 Mm). The starting time of the impulsive heating is set at t_ev = 100 s. The vertical black lines indicate the basis of the loop’s central part and the horizontal dotted red line shows the values log T = 5.0. t_ev + 2 s (green) and t_ev + 4 s (red), which are the closest recorded times when m₄ and m₂ reach apex temperatures above log T = 5.0.