Distribution of the sample in configuration space. We show the histogram of the 5 136 533 stars (see text) with a binning of 10×10 pc. The Sun is shown as an orange star and the GC is located at (X, Y) = (0, 0). The golden dots indicate the centres of the volumes used for the exploration in different Galactic neighbourhoods. Each radial line contains 51 volumes, and each arch at fixed radius has 21 volumes. The purple patches correspond to the sub-samples from the wider grid for which we perform a detailed study of their velocity distribution. The properties of these sub-samples are summarised in Table 1.
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