The relationship between the observed UV slope and stellar mass for the 2.0 < z ≤ 5.0 sample of this work. Green background image represents a 2D histogram of the β–M_* distribution, with 1, 10, 100 and 1000 sources contours displayed with thin black curves. Top panel. Black circles with error bars show median values of β in bins of M_* (Table 1), with the thick black solid curve depicting the best-fit functional form of Equation (12). For comparison, the relationships found in McLure et al. (2018), Álvarez-Márquez et al. (2019) and Bouwens et al. (2020) are shown. Bottom panel. Black curve as in the top panel with the color curves determined for individual redshift bins, following the procedure explained in Section 4.4.