All Figures

Figure 1: Stationary structure at   yr and shock trajectories of a J-type shock with n=104 cm-3, u=20 km s-1, and b=0. a)  Thermal structure: temperatures of the neutrals, ions and electrons. The crosses on the curve are the points where the flow time computed in the frame of the shock is equal to 10n yr, n being the number indicated near the cross. "+'' signs stand for neutrals and "x'' for charges. b)  Cooling structure: magnitude of the main cooling processes. c)  Chemical structure: abundance relative to hydrogen nuclei of species of interest. d)  Shock trajectory: position (thick curve) and velocity (thin curve) of the J-front against time, in the frame of the piston.

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In the text

	Figure 2: Same as Fig. 1 for a steady CJ-type shock with n=104 cm-3, u=40 km s-1, and b=0.1, at   yr. The dashed curve in  d) plots the position of the C-precursor against time.
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In the text

	Figure 3: Same as Fig. 2 for a steady C-type shock with n=104 cm-3, u=20 km s-1, and b=0.1, at t=105 yr.
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In the text

	Figure 4: Same as Fig. 1 for a weakly dissociative J-shock of parameters n=105 cm-3, u=25 km s-1, b=0 at t=50 yr. In panel  d), the thick solid line is the trajectory of the shock in a simulation with a reduced network of 8 species. The simulation with the whole network is plotted in a thick dashed line, up to the point where it stalled.
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In the text

	Figure 5: Same as Fig. 1 for a partly ionising J-shock of parameters n=104 cm-3, u=40 km s-1, b=0 at t=220 yr.
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In the text

	Figure 6: Temperature and pressure snapshots for the first period of the bouncing shock with parameters b=0, n=105 cm-3, and u=25 km s-1. The plotting scale for the temperature is logarithmic while it is linear for the pressure.
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In the text