Fig. 4.
Log([N II]/Hα) versus radial velocity diagram. All the points in the figure have the same colours and markers as Fig. 3. The horizontal dashed grey line and the grey band correspond to the reference value at log([N II]/Hα) = −0.3 and the uncertainties for the log([N II]/Hα) ratio, respectively. The upper left cross indicates the typical error of both parameters.
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