Fig. 4

Highest and lowest polarisation diagram at 1500 Å. The grey shaded area represents the allowed fraction of unpolarised light depending on the inclination (see text). Polarisation measurements of our sources are reported as vertical lineswithout the uncertainties for visibility (i.e. the uncertainties increase the allowed range of unpolarised light accordingly).
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.