Combined X-shooter spectrum of J0015+1842 in black with best-fit SED corrected for dust extinction shown in red. For visual purposes, the data have been filtered (rejecting 4-σ outliers; light grey) and smoothed (black) in order to remove the strong skyline residuals in the NIR data. The position of the 2175 Å extinction feature is indicated by an arrow, and the best-fit model without the 2175 Å feature is indicated by the purple line. The unreddened quasar template is shown in blue. Photometric data from SDSS (u, g, r, i, and z bands) and WISE (band 1) are shown as orange squares.