First-order moment maps of the 1 mm (left panel) and 3 mm (right panel) methanol lines. In each panel the solid contours show the velocity integrated line intensity. The contour spacings are 200 mJy beam^-1 km s^-1 and 20 mJy beam^-1 km s^-1 for the 1 mm and 3 mm methanol lines, respectively. The dashed line shows the orientation of the outflow, while the dashed arrow indicates the orientation of the velocity gradient as determined from the first-order moment fit (see Sect. 3). The line and arrow intersect at the position of MM1.