  Super Soft X-ray Sources (SSS) are powered by nuclear burning on the surface
of an accreting white dwarf, they are seen around 0.1-1 keV (thus in the soft
X-ray regime), depending on effective temperature and the amount of intervening
interstellar neutral hydrogen N_H. The most realistic model to derive physical
parameters from observed SSS spectra would be an atmosphere model that
simulates the radiation transport processes. However, observed SSS
high-resolution grating spectra reveal highly complex details that cast doubts
on the feasibility of achieving unique results from atmosphere modeling. In
this article, I discuss two independent atmosphere model analyses of the same
data set, leading to different results. I then show some of the details that
complicate the analysis and conclude that we need to approach the
interpretation of high-resolution SSS spectra differently. We need to focus
more on the data than the models and to use more phenomenological approaches as
is traditionally done with optical spectra.
