Velocity integrated image of C¹⁸O emission from 7.8 to 12.4 km s⁻¹. We note that the area covered in the C¹⁸O map is larger than for the H₂CO image, shown in Fig. 3. The black star represents the position of the protostar. The scalebar indicates a length of 1000 au. The white ellipse in the bottom left corner represents the beam size. The primary beam of the image is drawn with a white dotted circle.