IRAM 30 m spectrum of the HCN (J = 1 → 0) emission in V4334 Sgr (Sakurai’s object). The width of each channel is 20 km s-1. The dotted vertical line corresponds to the systemic velocity of the source, vsys = 125 km s-1 (Duerbeck et al. 1997). The flux density in the right axis was calculated using the corresponding value of Γ shown in Table 1.
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