Free Access
Fig. 4
Maser negative optical depths at 22 and 658 GHz in the kinetic temperature and H2 density plane. The contours are in regularly spaced intervals of δ (optical depth) = 1. The highest contour is for an optical depth of 12 at both 22 and 658 GHz.
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.