lower limit of $\sim 100$ keV was reported from [[*BeppoSAX*]{}]{} [@risaliti2002] and [[*Swift*]{}]{}’s BAT [@ricci2017]. From the analysis of the 58-month [[*Swift*]{}]{}’s BAT light curves, [@caballero2012] report the detection of hard X-ray spectral variability in the 14–195 keV band. However, [@soldi2014] do not find strong evidence of long-term hard X-ray spectral variability from BAT data up to 66 months.

NGC 2110
--------

[NGC 2110]{} is another nearby [$z=0.00779$, @gallimore1999], X-ray bright Seyfert galaxy. [@diniz2015] report a black hole mass of [$2.7^{+ 3.5}_{- 2.1} \times 10^{8}$]{} [M$_{\odot}$]{}, from the relation with the stellar velocity dispersion. From [[*BeppoSAX*]{}]{} data, [@malaguti1999] found the X-ray spectrum to be affected by complex absorption. This has been later confirmed by [@evans2007], who find the [[*Chandra*]{}]{}+[[*XMM–Newton*]{}]{} data to be well fitted with a neutral, three-zone, partial-covering absorber. [@rivers2014] find the [[*Suzaku*]{}]{} data to be well fitted with a stable full-covering absorber plus a variable partial-covering absorber. A soft excess below 1.5 keV is also present [@evans2007], and possibly due to extended circumnuclear emission seen with [[*Chandra*]{}]{} [@evans2006]. No Compton reflection hump has been detected with [[*Suzaku*]{}]{} [@rivers2014] or [[*NuSTAR*]{}]{} [@marinucci2015], despite the presence of a complex [Fe K$\alpha$]{} line. According to the multi-epoch analysis of [@marinucci2015], the 