The plot below (made by Schiminovich and me today) shows the GALEX–SDSS colors of quasars with photometric redshifts between 2 and 3.5. The white points have spectroscopic redshifts in that same range; the cyan points don't. The vertical axis is a GALEX–SDSS color that separates them well. This might have implications for SDSS-3 quasar target selection, which takes place in regions of the sky with good GALEX coverage.
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