Comparison between galaxies in our sample and the main sequence of star-forming galaxies. The upper panel displays four of our UHR candidates assuming their best-fit z ≤ 8 solutions (represented as colored stars) alongside their median stack (represented as a cyan cross). Since the best-fit z < 8 solution for LIZZAN is at a higher redshift (z ∼ 4.31) with respect to its companion UHR candidates, we checked its consistency with the main sequence in a separate plot (bottom panel) alongside CURION (portrayed as a pea green diamond), falling in a similar redshift window. The main sequence is modeled after the parametrization of Popesso et al. (2023) and is represented in each panel as a black line computed at the average redshift between the displayed objects (⟨z⟩∼1.00 and ⟨z⟩∼4.89, respectively), alongside a 1σ confidence interval (shaded gray area).