Open Access
Fig. 4.

Example Littrow solution check, showing the residuals of cross-order fits between the inverse echelle orders and the fractional wavelength contribution. Each line corresponds to a different pixel position. It should be noted that for the bluest orders, there is very little flux at pixels 500 and 3500.
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.