  Line intensities and oscillator strengths for the controversial 3C and 3D
astrophysically relevant lines in neonlike Fe${}^{16+}$ ions are calculated. We
show that, for strong x-ray sources, the modeling of the spectral lines by a
peak with an area proportional to the oscillator strength is not sufficient and
non-linear dynamical effects have to be taken into account. Furthermore, a
large-scale configuration-interaction calculation of oscillator strengths is
performed with the inclusion of higher-order electron-correlation effects. The
dynamical effects give a possible resolution of discrepancies of theory and
experiment found by recent measurements, which motivates the use of
light-matter interaction models also valid for strong light fields in the
analysis and interpretation of astrophysical and laboratory spectra.
