Bluebottle diagram of point sources. The central sequence starts with white dwarfs below I_E − Y_E < 0, continues with stars, and ends in the cool tip with UCDs at I_E − Y_E ≳ 2.5. Their nature is confirmed with the benchmark UCDs from Zhang et al. (2024). We overplotted both the new photometric candidate T dwarfs from this work (symbols with error bars), and those that were spectroscopically confirmed (open circles), as listed in Table A.2. ATMO models (Phillips et al. 2020) indicate the UCD parameter space, while the PARSEC model traces main sequence and evolved stars with redder Y_E − H_E.