a) Optical image (grayscale) overlayed with contors of 8.4 GHz continuum emission (black) (Testi et al. 1995) and contors of [C ii] (green dashed) and CO 11–10 (red). b) Intensity of ¹³CO 2–1 emission integrated between v_LSR =  −17 to  − 10  km s^-1 (Ungerechts et al. 2000) (grayscale) overlayed with contors of CO 11–10 (red) and [C ii] (green dotted). Contour levels of [C ii] are the same as inFig. 1, for CO 11–10: 6.8 to 32.1  K km s^-1 (peak) in steps of 3.6  K km s^-1. The star and the triangle denote the positions of Testi’s NIR sources A and B, respectively.