Left: map of integrated intensity distributions of ¹³CO 2–1 (greyscale, red contor), [C ii] (black), CO 11–10 (blue), and [C i] (green). Right: cut through the [C ii] peak and the CO 11–10 peak #2. The black dotted vertical line denotes the position closest to the B1 star along the cut. Integration ranges: [C ii] and [C i] [ − 20; − 5], CO 11–10, and ¹³CO [ − 17;  − 10] ( km s^-1).