Upper panel, black: HCN J = 1 → 0 spectrum with a channel spacing of 3.3 km s⁻¹ from the central 0.25 arcmin² of NGC 4945. The covered area is limited by α_J2000 = 13^h 05^m26^s and 13^h05^m29^s and by δ_J2000 = –49°28′50″ and –49°28′20″. The ordinate displays unweighted average values from pixels of the entire area (moment –1) as a function of barycentric velocity in units of mJy beam⁻¹. For spatiallyintegrated flux densities, multiply by 200 ± 20. Lower panel, black: A CS J = 2 → 1 spectrum with a channel spacing of 3.0 km s_¹ from the same region is shown. Ordinate and abscissa: same units as for HCN. For spatially integrated flux densities, multiply by 240 ± 24. Applied pixel size for both spectra: 1″ × 1″. Overlayed spectra (red) with lower velocity resolution and larger beam size (≈1′), matched to the amplitude of our spectra, are taken from Wang et al. (2004).