Fig. 29.
Fraction of PNe targeted with spectroscopic observations where a narrow [O III] 5007 Å emission line was detected. The uncertainty in detection fraction is the binomial proportion confidence-interval of observed PNe in any magnitude bin obtained using the Wilson score interval method (Wilson 1927). The blue dashed line shows the 50% detection limit of the spectroscopic follow-up.
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.