Centroid velocities (top) and linewidths (bottom) of c-C₃H₂ (left), CH₃CCH (right), and CH₃OH (middle) towards the prestellar core L1544. Black contours show 50% and 90% of the respective molecular emission peak. White contours show 30%, 50%, and 90% of the H₂ column density peak derived from Herschel maps (Spezzano et al. 2016). The white circle in the bottom-left corner indicates the beam size of the IRAM 30 m telescope (32″).