Variations of the bias (left) and efficiency (right) of the maximum likelihood estimator as a function of the column density and excitation temperature. The solid and dashed red contours correspondto the frontiers where the relative precisions on the estimations on the four parameters are ρ = 20, and 10%, respectively, as defined in Fig. C.1. The 13CO(1−0) and 13CO(2− 1) lines are simulated with σb = 100 mK, ΔV = 1.1 km s−1, and σV = 0.61 km s−1.
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.