Fig. 4

Total-to-thermal noise ratio. For the phase noise calculation we use a PWV = 1.0 mm with a deviation of ΔPWV = 0.15 mm, with an exposure time of two hours. Different line styles represent different wavelengths. Thanks to the sequential simulation process of thermal and phase noise, ratios below 1.00 are possible, because the phase and thermal noise can erase each other.
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.