Rest-frame EW of the [O II] line plotted against the total line flux for S/N > 3 objects in the zCOSMOS sample within z = 0.5−1.5 (7338 objects; black contours and small open circles out of the contours) with the XMM-COSMOS sources superimposed (blue = 57 Type 1 AGN, red = 152 Type 2 AGN). XID5395 is highlighted as a yellow star. Out of the five objects with [O II] EW larger than 150 Å, four are Type 2 QSOs (with LX ≳ 1044 erg s-1). XID5395 is the only one with rest-frame EW larger than 200Å in the entire sample (yellow starred symbol).
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