Fig. 1.

Representative samples of the three different image-quality classes. High-quality observations are characterized by sharp structures and no degrading effects (left panel). Low-quality observations suffer from degrading effects or appear blurred (middle panel). Anomalous observations show strong atmospheric influences or instrumental errors which excludes them from further scientific analysis (right panel).
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.