Fig. 2
EW[O III] distribution for the Palomar sample (top panel). The first bin contains 299 objects, including 96 emission galaxies whose [O III] line is not detected. In the other panels we show instead the EW[O III] distribution for the SUNNS subsample derived from the Palomar (middle) and the HST (bottom) observations. The filled areas indicate EW[O III] upper limits; the horizontal arrows show the objects with EW[O III] larger than 13 Å.
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