ENLR size against AGN bolometric luminosity for three different ENLR size definition. The maximum size (left panel), the ENLR out to an intrinsic limiting surface brightness of Σ₁₆ = 10⁻¹⁶/(1 + z)⁴ erg s⁻¹ cm⁻² arcsec⁻² (middle panel) and to Σ₁₅ = 10⁻¹⁵/(1 + z)⁴ erg s⁻¹ cm⁻² arcsec⁻² (right panel). The measurements for the famous changing-look AGN Mrk 590 (Denney et al. 2014) and Mrk 1018 (McElroy et al. 2016; Krumpe et al. 2017) are included as horizontal dashed lines to highlight the range in luminosity with filled and open symbols marking the maximum and minimum brightness. Left panel: we add measurements on maximum ENLR sizes on unobscured QSOs from Husemann et al. (2013a) and 3C 273 Husemann et al. (2019a). In the middle panel we include ENLR size measurements at Σ₁₆ for a large sample of obscured AGN from the MaNGA survey presented by Chen et al. (2019b). For the ENLR size at Σ₁₅, we included data for unobscured QSO from Liu et al. (2014), obscured QSOs from Hainline et al. (2014) and the additional data point for 3C 273 (Husemann et al. 2019a). Literature ENLR scaling relations as well as the best-fit linear relation to the CARS data are shown as solid lines. The red shaded band indicates the 1σ confidence band for the ENLR relation of CARS.