Open Access

Fig. 2.

image

Figures illustrating the method we used to derive unbiased average luminosity and line ratios (see Sect. 2.5). Upper left panel: probability density distribution of the HCN(5-4) luminosity of our sources determined using a bootstrap technique (Sect. 2.3). The gray filled histogram is the probability distribution of the mean luminosity of our five sources (see Sect. 2.5). The vertical dashed line indicates the zero flux. Upper right panel: same figure for HCO+(5-4). Lower panel: probability density distribution of the ratio between the mean HCN(5-4) and the mean HCO+(5-4) luminosities. The vertical dashed line indicate the median value of the distribution.

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.