Free Access

Fig. 3

image

Illustration of the simplified “toy” model representing the emitting medium. The emission comes from a homogeneous shell at the surface of a clump. In this shell, the emitting material is mixed with the absorbing one. The emission is partially absorbed while traveling across the shell. An additional extinction is caused by a purely absorbing dust screen positioned between the emitting shell and the observer.

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.