Free Access
Fig. A.2.

OSIRIS/GTC normalised spectra of five of the σ Orionis stars of different spectral types (in blue) on a grid of spectra of standard stars used for visual spectral-type identification of the OSIRIS spectra. The main spectral lines and most relevant absorption bands are also marked.
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.