Location of the spots detected on January 13, 2018 for the v = 1, J = 1−0 SiO maser transition. The proper motion vectors of the two strongest spots (at 54.9 and 54.2 km s⁻¹) are indicated by the cyan and blue arrows, respectively. A third spot is detected at ∼58 km s⁻¹ and located at ∼1 mas to the east of the strongest spot. The location of the Gaia source and its proper motion is indicated by the pink cross and the red arrow, respectively. The lines associated to the arrows indicate the proper motion errors. The gray and yellow crosses mark the positions and uncertainties of the continuum and SiO extended emission peaks detected in the ALMA maps, respectively.