D_n4000 and H_δ (in Å) distributions of AGNs and galaxies in the reference catalogue, for different morphologies. Non-BD AGNs tend to have higher D_n4000 values compared to non-BD galaxies that do not host an AGN. However, the opposite trend is observed for BD systems, in which case AGNs tend to have lower D_n4000 values compared to their non-AGN counterparts. Regarding the Hδ, non-BD AGNs tend to have lower H_δ values compared to non-BD, non-AGN galaxies, while BD AGNs have a flat H_δ distribution and BD AGN tend to have high Hδ values.