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Table 2

Parameters of lines observed towards the core centre.

Line TMB dV TMB,peak VLSR V Tex τ N
(K km s−1) (K) (km s−1) (km s−1) (K) (1013 cm−2)
oH2D+(1ıo −111) 0.308 (0.012) 0.718 (0.041) 4.152 (0.006) 0.359 (0.016) 7.1 (0.4) 0.62 (0.15) 1.1 (0.3)
N2H+ (4 − 3) 0.189 (0.013) 0.609 (0.047) 4.127 (0.007) 0.198 (0.019) 6.3 (0.5) 0.97 (0.41) 0.8 (0.6)
DCO+(5 − 4) 0.117 (0.006) 0.499 (0.021) 4.355 (0.003) 0.205 (0.008) 5.8 (0.3) 0.78 (0.20) 2.7 (1.3)

Notes. Error estimates based on the RMS noise of the spectra are shown in brackets.

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