Gradic, D., Krychowiak, M., König, R., Perseo, V., & W7-X Team, Max Planck Institute for Plasma Physics, Max Planck Society (2019). Ultra-high resolution spectroscopy for Wendelstein 7-X. Poster presented at 22nd International Stellarator and Heliotron Workshop 2019 (ISHW 2019), Madison, WI.