Fig. 2

Selection of GC candidates based on sharpness value. Shown is a g-band example of the sharpness value versus magnitude for all sources with PSF photometry (small crosses), the known IKN GCs (large solid, blue circles), and the SDSS GC candidates (open circles). The PSF stars are shown with small solid symbols (dark circles).
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.