Column density maps of HC₃N and CH₃CCH and their deuterated isotopologues. The column densities are derived with a constant excitation temperature of 7 K and 10 K for HC₃N and CH₃CCH and their isotopologues, respectively, and are corrected for optical depth. To derive the column density of HC₃N, we used the emission of HCC¹³CN, assuming a constant ¹²C/¹³C=68 (Milam et al. 2005). The solid line contours indicate the 3σ level of the integrated intensity. The dashed line contours represent 30%, 50%, and 90% of the H₂ column density peak derived from Herschel maps (Spezzano et al. 2016). The circle in the bottom-left corner indicates the beam size of the IRAM 30 m telescope (31″). The markers in grey represent the dust peak (triangle) and the molecular emission peaks of CH₃OH (diamond), CH₃CCH (star), and c-C₃H₂ (plus sign).