Three epoch EVN maps of 6.7 GHz methanol maser spots detected in G23.657–00.127. The coordinates are relative to the brightest spots in each epoch (Table 1). The colours of circles relate to the LSR velocities as shown on the right bar. The dotted ellipses trace the best fits to all spots, except the SW blue-shifted ones, detected at each epoch (Table 2). The dashed ellipses indicate the widthof the ring as derived in the first epoch data (Bartkiewicz et al. 2005). The grey lines at PA ~ 80° (N to E) delineate the emission-free part of the maser ring discussed in Sect. 4.2