Volume renderings of the thermal continuum emissivity at 2 keV (left) and of the plasma temperature (right) at different instants for model S. The left and right columns of each plot show a perspective view and a top view of the same loop. The colour scales represent emissivities (ϵ; see Eq. (9)) between 5 × 10¹² and 5 × 10¹⁴ erg s^-1 cm^-3 Hz^-1 and plasma temperatures between 1 and 2 MK. The orange and blue lines represent magnetic field lines rooted at the left and right footpoints. The instants represented are from top to bottom, t = 34, 80, 136 and 227 s. The grey line delimits the bottom face of the numerical domain (a square of dimensions 20 × 20 Mm).