Profiles of the neutral sound speed (solid black), velocity of the neutrals (solid blue) and that of the ions (solid red) in the frame of the shock, and temperature of the neutrals (dot-dashed green) computed in stationary shocks propagating in media with different densities and radiation field intensities. All the other parameters are set to their standard values (see Table 1), and the standard value of the buffer visual extinction is set to . C-type, C*-type, and CJ-type shocks are highlighted in green, yellow, and violet, respectively.