Obscuration properties of the eFEDS-WERGS sample. Top left: histogram of log(N_H/cm⁻²). The sources are divided into two subgroups with spec-z (cyan) and phot-z (orange). Top right: log N_H as a function of redshift. The gray error bar shows a typical logarithmic error of log N_H. Bottom left: log N_H as a function of 0.5−2 KeV X-ray luminosity (). The orange shaded area represents the region of obscured AGN with log(N_H/cm⁻²) > 22. The symbols are same as in Fig. 1, and the gray error bar shows a typical logarithmic error of log N_H and log. Bottom right: relation between the flux density ratio of 12 μm to optical i_AB band and the log (N_H/cm⁻²). The dashed black line represents the slope of the fitting. The red shaded area represents the region of extremely red quasars which fulfill f_ν(12 μm)/f_ν, i-band > 10^1.84 (Hamann et al. 2017). The orange shaded area represents the obscured AGN region. The other symbols are the same as in Fig. 1.