  We provide a theoretical analysis of Radiative Shocks, defined as
supercritical shocks accompanied by an ionization wave in front of the density
jump. In particular, we look at the influence of opacity variation with
temperature and photon energy on spatial structure of radiative shocks, with a
view to understanding a split precursor feature observed in recent experiments.
We show that multigroup processing, a more refined angular description and
improved low temperature opacities are needed to explore the radiative
precursor structure, at least in some temperature regimes where rapid change of
ionization can be found.
