Spectra of the nuclear emission in NGC 1377. Dashed vertical line indicates v = 1740km s^-1. Top panels: CO 3−2 in high- (left) and low- (right) resolution spectral mode. The dashed red box of the right panel indicates the zoomed-in region in the next panel. Centre: zoomed-in spectrum showing detections of H¹³CN J = 4−3 and either HC₃N J = 38 − 37ν₄ = 1, ν₇ = 1 or SO₂ 16(4,12)−16(3,13). Bottom: panels showing detections of HCO⁺J = 4−3, HCN J = 4 − 3ν₂ = 1f (left) and a line that we tentatively identify as HC¹⁵N J = 4 − 3. All spectra apart from in panels 2 and 3 have Gaussian smoothed with FWHM of two channels. In panels 2 and 3 there has been no smoothing but frequency resolution is reduced by a factor of 3 (these data stem from another spectral window than that presented in the first panel).