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Fig. 2

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Comparison between the narrow [O III] line and the broad Hα fluxes. Red squares are BLOs, black circles are HIGs, with empty symbols representing upper limits. The fluxes are in erg cm-2 s-1. The solid line marks the average ratio between the two emission lines as measured in BLOs, (FHα     broad/F[O  III] ~ 8). The dashed lines illustrate a change of a factor of 4 in this value.

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