Extended Data Fig. 2: Comparison of the optical spectra of WOH G64.
From: The dramatic transition of the extreme red supergiant WOH G64 to a yellow hypergiant
Top: Spectral region between 6200-7200 Å. Bottom: Spectral region of the Ca II triplet region. The X-Shooter (2016) and MagE (2021) spectra are normalized, and the UVES spectrum is shown with an offset. The main spectral features are indicated for each epoch.
