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%info@http:://golem.fjfi.cvut.cz/wiki/root/GW4reports
\def\GWslide{\slide{Optical spectroscopy}{
   \GWif{width=0.85\tw}{Diagnostics/Radiation/Minispectrometer/Slides/Naydenkova-2025-Calibration/Fig.png}{Calibration and Identified VIS lines in the tG discharge}
\begin{itemize}\footnotesize
  \item Optical spectroscopy was used to study plasma composition during transport barrier formation.
  \item Five compact spectrometers covered a wide spectral range from 250 to 1100\,nm.
  \item Helium line emission decreases in time, while low-Z impurity lines increase.
  \item Identified impurity lines indicate enhanced wall interaction and erosion of in-vessel components.
  \item Spectroscopy provides indirect evidence of strong impurity influx during transport barrier phases.
\end{itemize}
}}