Integrated emission of selected transitions of CH₃OH in the region above the 5σ detection in the line data cubes (~0.5 Jy beam^-1). The black solid contours show the 1.3 mm continuum emission as in Fig. 2. The solid line shows the axis of OF1, while the dashed line has been chosen, for sake of clarity, to represent the three possible directions of the N–S outflows drawn in Fig. 1. The red squares mark the R1, R2 and B1 peaks of the CO(2−1) emission detected towards OF1 and OF2–OF3 (see Fig. 1a). The white ellipse represents the FWHM 2-D Gaussian fit to the data.