A sketch of the two types of X features appearing in edge-on views of disk galaxies: (a) The CX type, in which the wings of theX cross the centre of the system, and (b) the OX profile, in which the wings of X avoid the centre.
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.