GALACTICNUCLEUS false colour image of the central region of the NSD. The white rectangles indicate the regions covered by the proper motion catalogue. The white dashed circle shows the effective radius of the nuclear star cluster (∼5 pc, e.g., Gallego-Cano et al. 2020) with Sagittarius A* at its centre. The white dashed lines indicate the four regions used for the distance and extinction analysis in Sect. 4.