Three-colour image of G34.77. Red is 24 µm emission (Spitzer MIPSGAL; Carey et al. 2009), green is 8 µm emission (Spitzer GLIMPSE; Churchwell et al. 2009), and blue is 1 GHz continuum emission (THOR survey; Beuther et al. 2016; black contours from 3 to 27 Jy beam⁻¹ by 6 Jy beam⁻¹ ). The continuum emission probes the gas associated with the expanding shell of the SNR. The magenta contour (A_V = 20 mag Kainulainen & Tan 2013) highlights the cloud shape. Superimposed on the map are the five positions of interest (white circles; 34″ IRAM 30 m beam at the N₂D⁺ frequency of 77.112 GHz). The cyan contours correspond to the ALMA SiO contours from Cosentino et al. (2019; from 0.05 to 0.3 Jy beam⁻¹ by 0.05 Jy beam⁻¹).