Channel maps of the western third of DR20 around region A in the HCO⁺(1 − 0) and H¹³CO⁺(1 − 0) emission lines. The colored and black contours show the HCO⁺(1 − 0) emission, whereas the white contours present the H¹³CO⁺(1 − 0) emission. Contour levels are always in 5σ steps, and the central velocity is marked in each panel. The magenta five-point stars marks the position of the main continuum peak (Fig. 5). The yellow contours in the first and last panel outline the GLOSTAR cm continuum data from 0.03 to 0.12 Jy beam⁻¹ in steps of 0.01 Jy beam⁻¹.