Open Access

Fig. 1.

image

Download original image

Hα/Hβ line ratio dependence on the electron temperature and density. The right panel is a close-up covering the ranges for these parameters obtained for the PNe of M31. The underlying data used to draw the contours are the raw data from Storey & Hummer (1995).

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.