Spectra averaged over an area of 0.7 pc × 0.7 pc centered at the position of IRS 1 (corresponding to the area shown in Fig. 1, right). The blue dotted vertical line indicates the source velocity (v_LSR = 10 km s⁻¹). The red dashed vertical lines indicate the velocity range where the S∕N is above 3σ for the molecular emission. These ranges are used to generate the integrated intensity maps presented in Fig. 3. The velocity ranges correspond to 5–18 km s⁻¹ for ¹³CO, 7–15 km s⁻¹ for C¹⁸O, 6–14 km s⁻¹ for HNC, and 7–12 km s⁻¹ for N₂ H⁺.