Same as Fig. 3 but for G31.047+00.356. We note that all maser spots (instead of cloudlets, as in the other targets) are presented due to the complex structure in the western region, which is also zoomed-in for clarity in the left panel. The centre of motion is marked by the plus sign, the (0,0) point, and it is shifted by (−7.9729 mas, −0.6561 mas) relative to the brightest spots listed in Table 1.