Hunting pre-stellar cores with APEX: Corona Australis 151, the densest pre-stellar core or the youngest protostar?

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Fig. 1

Observations of the N₂H⁺ and N₂D⁺ transitions towards CrA 151 (black histograms) and synthetic spectra obtained with the MCMC approach applied to the non-LTE radiative transfer analysis (red histograms; see Sect. 3.3).

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