Fraction of log(L)∼44 obscured AGN with N_H > 10²² cm⁻² (f₂₂) as a function of redshift. The light blue squares show the results from this work. The prediction of the Gilli et al. (2022) model for the evolution of the obscured fraction with the redshift is shown as the indigo lines, with different styles representing the different parameters of the model (see Sect. 5.2). Left: obscured fraction derived using N_H > 10²² cm⁻² as the threshold (f₂₂). The results from this work are compared with those of Burlon et al. (2011, blue diamond), Liu et al. (2017, green triangle), Aird et al. (2015, red shaded), Iwasawa et al. (2020, gray star), and Peca et al. (2023, green shaded). The Aird et al. (2015), Liu et al. (2017), Iwasawa et al. (2020), and Peca et al. (2023) obscured fraction consider column densities up to 10²⁴ cm⁻². Right: obscured fraction derived using N_H > 10²³ cm⁻² as the threshold (f₂₃). The results from work are compared with those of Burlon et al. (2011, blue diamond), Liu et al. (2017, green triangle), and Vito et al. (2018, black pentagon). The Vito et al. (2018) obscured fraction consider column densities up to 10²⁵ cm⁻².