Spectra of CH₃CCH (left) and c-C₃H₂ (right) at the dust peak of each core (black) extracted within a circular aperture of radius 8" and the corresponding Gaussian fit (cyan). The 3σ level is indicated by the grey dotted line. The systemic velocity with respect to the line chosen for analysis is shown by the red dotted line. The Gaussian fit parameters are annotated for each line.