Proper motions of 6.7 GHz CH₃OH masers detected over three epochs with the EVN. Symbols, colors and contours have the same meaning as in Fig. 1. The plotted field of view includes the maser clusters “A”, “B”, “C” and “D” (top panel), and cluster “E” (lower panel). Colored arrows show the measured maser proper motions, with dotted arrows denoting the most uncertain measurements. The scale for the proper motion amplitude is given by the black arrow in the lower left corner of each panel.