Distribution of the X-HESS AGNs in the α_ox − log L_UV plane. Single- and multi-epoch AGNs are shown in grey and red, respectively. White circles with red edges highlight the high-flux state of the multi-epoch X-HESS AGNs. Solid and dashed black lines indicate the best-fit relation from Lusso et al. (2010) and the corresponding 1σ spread. The solid red line marks the reference value for X-ray weakness, i.e. Δα_ox ≤ −0.3 (Pu et al. 2020). Dotted and dash-dotted blue and green lines describe the time evolution of α_ox for the AGNs X-HESS 16 and X-HESS 5, respectively. Specifically, the latter has experienced a couple of transitions between phases of standard and weak X-ray emission over the different observations.