Free Access
Fig. B.21.
NASA/ESA Hubble Space Telescope image of NGC 6720, a composite of R filters 6580 Å and 6730 Å (red), G filters 6560 Å and 6450 Å and V filters 5020 Å (green), B filters 4690 Å and 4870 Å (blue).
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.