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Fig. 1

Average IUE spectra (1200–3200 Å) of HE 1143-1810 (top) for the three observing epochs, and Mrk 110 (bottom) for the observing epoch. Solid red circles show the OM measures for the UVW2, UVM2, and UVW1 filters.
This figure is made of several images, please see below:
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