Zoom of the temperature map for the northwestern area around clump A. The color-scale again shows the temperature map derived from the integrated intensity ratios of the HCN(1−0) and HNC(1−0) line following Hacar et al. (2020). The contours outline HCO⁺ and H¹³CO⁺ emission structures at specific velocities (Fig. 8). Full black contours plot HCO⁺ at −6km s⁻¹, dotted contours show HCO⁺ at 2.8km s⁻¹, and magenta contours show H¹³CO+ at -2.8km s^-1. Contour levels for HCO⁺ start at 5σ and continue in 10σ steps. For H¹³CO⁺ only the 5σ contour of 6 mJy beam⁻¹ is shown.