Top: same as Fig. 6, but for G24.78. The cross in the top panels marks the position of the hypercompact Hii region studied by Beltrán et al. (2007) and the dashed line denotes the axis of the bipolar outflow detected by Codella et al. (2013) in the SiO(5–4) line. The dotted line indicates the direction adopted for the corresponding position–velocity plots. Labels A1 and A2 mark the corresponding HMCs, as in Fig. 2. Bottom: same as top panels, but for the ¹³CH₃CN(13–12) K = 2 line.