Spectra of the N2D+(1–0) transition (top panel), the N15ND+(1–0) transition (middle panel), and the 15NND+(1–0) transition (bottom panel) observed toward L1544. The intensity scale is the main-beam temperature. In the top panel, the red curve depicts the result of the HFS fit. The N15ND+(1–0) transition and the 15NND+(1–0) transition were not detected down to 3σ levels in 0.2 km s−1 channels of 6.9 mK and 6.3 mK, respectively. The vertical blue lines indicate the positions of the expected hyperfine components.
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