  In multiply-charged ion plasmas, a significant number of electrons may occupy
high-energy orbitals. These "Rydberg" electrons, when they act as spectators,
are responsible for a number of satellites of X-ray absorption or emission
lines, yielding a broadening of the red wing of the resonance lines. The
contribution of such satellite lines may be important, because of the high
degeneracy of the relevant excited configurations which give these large
Boltzmann weights. However, it is in general difficult to take these
configurations into account since they are likely to give rise to a large
number of lines. We propose to model the perturbation induced by the spectators
in a way similar to the Partially-Resolved-Transition-Array approach recently
published by C. Iglesias. It consists in a partial detailed-line-accounting
calculation in which the effect of the Rydberg spectators is included through a
shift and width, expressed in terms of the canonical partition functions, which
are key-ingredients of the Super-Transition-Arrays model. The resulting method
can a priori be used in any detailed-configuration/line-accounting opacity
code.
