Fig. 12
Download original image
Maps of the ratios of the column densities for the outer layer. These ratios have been normalized by the basic values established using the elemental isotopic ratios of carbon and oxygen (see Eq. (24)). By construction N(HCO+)/N(12CO) = N(H13CO+)/N(13CO) (see Sect. 4.5). Contours are drawn at visual extinctions of 3, 7, and 16 mag.
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.