Snapsots of thermally unstable loops L1, L2, and L3 which form cool and dense condensations taken at t = 1230 s, t = 430 s, and t = 180 s, respectively. We show 100 field lines which intersect the condensation in each loop, with their colour corresponding to the temperature of the plasma. The surface at z = 1.2 Mm shows the concentrations of strong Joule heating in the chromosphere. The regions outlined in black with physical extent of 1 Mm × 1 Mm × 1.5 Mm mark the loop footpoint regions in the lower atmosphere.