Left panel: map of sources within a circle of 3.5 degrees in radius from UMi’s centre coordinates that we retrieved from the Gaia DR3 archive. The four ellipses show 3 (inner ellipse), 5, 11 and 12 times the galaxy r_h (outer ellipse, black solid line) adopting the position angle ϕ, r_h, and ellipticity from Sestito et al. (2023), and the centre coordinates of Irwin & Hatzidimitriou (1995) (see Table 1). A lime cross indicates the position of the cluster Muñoz 1. The magenta filled circles mark the sources classified as RR Lyrae stars in the Gaia DR3 vari_rrlyrae table that are located inside and outside 12 times the galaxy r_h. Four cyan circles mark additional candidate RR Lyrae stars listed in the Gaia DR3 vari_classifier_result table. The red and orange open circles mark spectroscopically confirmed members of UMi respectively from Kirby et al. (2010) and Pace et al. (2020), the blue empty squares mark the furthest RGB members of UMi from Sestito et al. (2023). Right panel: same as in the left panel, but showing with filled circles only sources classified as RR Lyrae stars in the vari_classifier_result and vari_rrlyrae tables, colour-coded according to their mean G magnitude.