Comparison of the reddened bright-state spectrum with the directly fitted dim-state spectrum for the CLQ J0823+4220. The dim- (grey curve) and bright-state (green curve) observed spectra are shown. We reddened the fitted components (as per Sect. 3.4.3) of the bright-state spectrum to fit the dim-state spectrum. This produced the red, dashed curve with a best-fit E(B − V) = 0.176. We also show the spectral components fitted directly to the dim-state spectrum as the blue, dashed curve for comparison.