Heating rate (red) and cooling rate (blue) of the pebble filament heated by the lightning discharge shown in Fig. 6. The curves show, from top to bottom, the heating and cooling rate at optical depth τ = 0, 50, 100, 150, 200. The cooing rates lie at a few times 10³ K h^-1 in the first 100 seconds after heating terminates at t_heat = 2 × 10³ s and subsequently fall to below 10³ K h^-1 over the next 1000 s. These cooling rates are in good agreement with the upper range of cooling rates inferred from chondrule textures (Hewins & Radomsky 1990).