Fig. 2
The flux recalibration based on SDSS photometry. Our spectrum of the 30′′ diameter central region of UGC 9837, scaled by the average offset between it and the SDSS g′ and r′ band photometry, is shown as a black line. The SDSS u′,g′,r′, and i′, band photometry are shown as blue dots and our spectrophotometry before rescaling at g′ and r′ bands as green squares.
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