Overlay of the ¹³CO (2–1) averaged absorption (dashed contours) on the 1.4 mm continuum emission (grayscale). The absorption has been averaged over the velocity interval 41.6–54.1 km s^-1. Negative contours range from −0.1 to −0.7 Jy beam^-1 in steps of −0.1 Jy beam^-1 (1σ ≃ 0.03 Jy beam^-1). Grayscale contours for the continuum emission are the same as in Fig. 1. The white cross marks the position of the 1.4 mm continuum emission peak. The synthesized beam is shown in the lower righthand corner.