Proper motions of the methanol maser cloudlets in G107 as measured relative to their centre of motion denoted by small black cross. Cones represent the proper motions in each cloudlet listed in Table A.2 and their colours and apertures correspond to the radial velocity (colour bar) and uncertainty, respectively. The velocity scale is shown at the top right corner. The dashed ellipse displays the model of ring derived from the 3D structure analysis shown in Fig. 6, where the yellow star shows the position of fitted centre of the ring. The grey star denotes the position of the 1.3 mm continuum peak (Palau et al. 2011).