Fig. 18

Download original image
Seeing measurements during a typical night. Each measurement refers to the average full width at half maximum (FWHM) expressed in arcsec of the stellar images recorded over a long CCD frame acquired during typically 17 minutes. During this night of 10 October 2024, 35 such frames have been acquired. The different symbols and colours refer to five different ranges of declination.
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.