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Fig. 2.


Spectra for the two lines of sight using the Keck/LRIS data. In the top panel, we show the ratio of the two spectra together with the best-fit quasar and galaxy model in red (see text). For comparison, we show the same model without the 2175 Å bump. In the middle and bottom panels, we show the individual spectra together with their best-fit dust-reddened quasar plus galaxy model in red. The shaded region in the bottom panel indicates the location and strength of the 2175 Å dust bump. The dotted line in the bottom panel shows the quasar-only contribution to the model.

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