Fig. 2
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Spectra of N2D+ (4–3) toward the whole sample of pre-stellar core candidates in Table A.1. The spectra follow the same order as in Fig. 1. The spectra have also been displaced in intensity by multiples of 2 K and centered at 0 LSR velocity, to allow for a comparison. Note that the spectrum of Oph 464 has been divided by a factor of 3 (see label) for clarity.
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