Fig. 4
Residual background from five consecutively recorded star images. Each image was fitted with 60 principal components. Therefore, the figure essentially depicts how the variable residual background changes on timescales of ~0.1 s. All images were filtered with a Gaussian filter to improve the visibility of the background structure.
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.