Fig. 10
Logarithm of the ratio between the [O III] flux and the continuum around the Hα line for the Palomar sample. The vertical lines are located at 3 and 5 times the median value measured for the SDSS red galaxies, i.e., 0.52 Å. The first bin of the distribution contains the 28 emission line galaxies where the [O III] line is not detected and the 68 lineless galaxies.
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