(Top panels) ¹³CH₃CN (12–11) K = 3 (black line), CHCN (12–11) K = 2 (dotted line), and C₂H₅CN (25_2,24–24_2,23) (gray line) obtained by integrating the emission inside the 3σ contour level area towards G24 A1 (left) and A2 (right). The vertical solid line indicates the V_LSR. (Bottom panels) Overlay of the averaged emission in the velocity interval (105, 107.5) km s^-1 (component 1; left) and (108.75, 114.25) km s^-1 (component 2; right) of the ¹³CH₃CN (12–11) K = 3 transition on the map of the 1.4 mm continuum emission obtained with the PdBI towards G24 A1 and A2. Contour levels are the same as in Fig. 1. The grayscale levels are 3, 6, 9, 12, 15, 20, and 30 times σ, where 1σ is 3.7 mJy beam^-1 for component 1, and 7.2 mJy beam^-1 for component 2. The black triangle marks the position of the HC Hii region in G24 A1 (Beltrán et al. 2007). The synthesized beam is shown in the lower right corner.