Comparison of rotational diagrams for HC₅N, HC₇N, and HC₉N, computed separately for this and other works. The blue circles are from our TMRT-65 m observations. The green triangles are obtained from Gong et al. (2015). The red diamonds are obtained from Kawaguchi et al. (1995). The dashed lines of different colors represent linear least-squares fit to the rotational diagram accounting for data obtained from corresponding surveys.