Example spectra of CO (left), CN (centre) and CS (right). All spectra are from a pixel removed by 1″ from the centre. This example only shows three hyperfine components for CN. The red lines show example fits to the data, CO being an optically broadened Gaussian, CN the ensemble of Gaussians, one for each hyperfine component, and CS a pure, optically thin Gaussian. Note that the spectra are Nyquist sampled in velocity.