The X-shooter spectrum of quasar J 2225+0527 shown in black together with the photometry from SDSS, UKIDSS, and WISE band 1 (shown in yellow squares, the errorbars are too small to be seen). The spectrum in the top panel has been smoothed for presentation purposes. The telluric absorption regions in the NIR (at ∼1.0, 1.1, 1.5, and 1.9  μm) have been masked out. The blue solid curve shows the unreddened quasar template, and the red solid curve shows the same template assuming the best-fitting dust model with iron emission and Ly α absorption included, see Section 4. For reference, the blue dashed line shows the best-fitting dust model without including the iron emission template. The largest offset between the red and the dashed line is observed around the C iii] emission line at ∼ 0.6 μm.