Velocity-integrated intensity maps of HNC and c–C₃H₂. The integrated intensities of HNC and c–C₃H₂ are represented as red and blue contours, respectively, stepped from 50% to 90% by 10% of the peak value. The greyscale shows the integrated intensity of HNC. The white cross “+” and “x” are marked as the source coordinates and the peak positions of ammonia emissions obtained from Anglada et al. (1989); Bachiller et al. (1987); Seo et al. (2015). The yellow star and cyan star are marked as IRAS sources and the protostars presented by Helou & Walker (1988); Marton et al. (2016), respectively.