Spectra of NH₃(1, 1) and HC₃N(2–1) (yellow) towards core L1512 (offset Δα,Δδ = 0′′, 0′′) obtained at the Medicina 32-m radio telescope with the high-resolution spectrometer MSpec0 (channel widths Δ_ch = 0.006 km s^-1 and 0.008 km s^-1 at 23 GHz and 18 GHz, respectively). The red curves are the best-fit model spectra. The observed linewidths are Δv(NH₃) = 0.19 km s^-1, and Δv(HC₃N) = 0.16 km s^-1.