Symmetric non-uniform heating profiles Q(z) /Q_H (left-hand axis), for apex (solid red line), fp1 (base of corona, dashed red line) and fp2 (base of TR, dot-dashed red line) heating (see Sect. 4), imposed on top of the temperature initial condition (solid blue line, right-hand axis). The upper (lower) panel corresponds to a 60 Mm (180 Mm) loop for which we take z_H = 0.75 Mm (z_H = 1.5 Mm) as the length scale of heat deposition.