The UV diagnostic diagrams plotted O III] λ λ1661, 1666/He II λ1640 vs. C IV λ λ1548, 1551/C III] λ λ1907, 1909 (left) and O III] λ λ1661, 1666/He II λ1640 vs. C IV λ λ1548, 1551/He II λ1640 (right panels). Symbols and line types are as in Figure 7. The red and blue filled areas represent the approximate regions associated with star-forming (SF) and active (AGN) galaxies from Gutkin et al. (2016) and Feltre et al. (2016), respectively. The plotted observations are from Berg et al. (2016), Amorín et al. (2017), and Senchyna et al. (2017).