Fig. 7
Optical throughput of the beam combiner instrument – excluding telescopes, VLTI beam relay, and detector quantum efficiency: low (red), R ≈ 500 (green), and R ≈ 4500 (blue) spectral resolution. The fringe tracker throughput is comparable to the science spectrometer at low resolution. The lower throughput of the R ≈ 500 and R ≈ 4500 spectral resolution is dominated by losses from the grisms.
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.