Best-fitting reduced χ² (for 18 deg of freedom) of the single-component LOC model fits as a function of SED- and line-affecting extinction intrinsic to Mrk 110. The contours signify the 1, 2, and 3σ confidence regions with respect to the best-fit statistic (marked with a dot). The triangle represents the intrinsic extinction considered in the baseline model (E(B − V) = 0.032, for both the lines and the ionising SED).