Comparison of the SED of HD 147550 (observation X0245) with the (interpolated) GSL model nearest the parameters of DR2 (Arentsen et al. 2019), at R = 500. In the uppermost panel, XSL data are shown in blue, black, and blue for the UVB, VIS, and NIR arms, over the model in red. In the lower panels, the model in red is overlaid on data in black. At this resolution the main disagreements are around the ends of the Hydrogen absorption line series, in particular around 370 nm. With A_V = 0.25, the extinction law of Cardelli et al. (1989) with R_V = 3.1 behaves adequately.