Large-scale bias as a function of hydrogen column density, N_H, when excluding different surveys from the combined AGN sample. In each set, the leftmost point shows the original reported result when including all eight surveys in the analysis. The adjacent open symbols (offset slightly for visual clarity) correspond to when one or more surveys are left out of the combined sample. The circles correspond to when CDF-S 7 Ms and CDF-N AGNs are excluded (Li et al. 2020). Squares, diamonds, and triangles correspond to when AGNs from XMM-XXL, CDWFS, and CCL are excluded, respectively. Finally, star symbols correspond to when we include only the surveys considered in Brightman et al. (2014), i.e., AEGIS-XD, 4 Ms CDF-S, C-COSMOS, and X-UDS (Kocevski et al. 2018). See Sect. 4.2 for details.