Embedded Euclidean space generated by UMAP for LS DR10 i-dropout sources after training the CL algorithm. All sources are represented as gray countours given by the number density; known M, L and T dwarfs are: brown, black and red crosses, respectively; and Gaia DR3 stars are yellow crosses. Spectroscopically confirmed quasars from the literature and the new quasars from this work are represented by filled circles and stars, respectively, all of them color-coded by their redshift. Quasar candidates are selected from the lower part of the left island where the source density is low and the contamination ratio with UCDs is ∼1:1. The two regions with the highest concentration of quasars are presented as zoom-in panels and highlighted with black squares.