Open Access
Fig. 1
Download original image
Astrometric correction parameters t1 (blue crosses) and t2 (red pluses) in arcsec for all 44 observations relative to observations 1912. The dashed line marks the pointing accuracy of Chandra of 0.4 arcsec.
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.