Line-of-sight analysis of the NSD metallicity and kinematics (the corresponding values are included in Table. A.1). Top panel: Target KMOS stars divided into five colour-coded regions at different longitudes. The grey star indicates the position of Sgr A*. Middle panels: mean metallicity obtained for the metal-rich (top) and the metal-poor (bottom) components of the two-Gaussian distribution. We plot metal-rich and metal-poor stars separately to highlight the detected gradients more effectively. Bottom panel: velocity dispersion of µ_b for the metal-rich and metal-poor components.