From top to bottom: spectra of HCO, CN, c-C₃H₂, HC¹⁵ N, H¹³ CN, HN¹³ C, H¹³ CO⁺, and C¹⁸ O toward the same example sources as in Fig. 1. Hyperfine structure fitting was used for H¹³ CN, and Gaussian profiles for the other molecular lines. The green lines represent Gaussian and HFS fitting results, and the red lines indicate the systemic velocity. HCO (1−0) was not detected toward AGAL045.474+00.134.