Upper panel: Hα luminosity distribution of the extraplanar H II regions of NGC 4254. The black shaded histogram indicates the Hα detected regions, the red histogram the distribution of the upper limits. The vertical dashed line shows the detection limit of VESTIGE, the vertical dotted line the median value for the Hα luminosity distribution of the detected sources. The error bars show how the median value of the distribution would shift assuming different corrections for dust attenuation (A(H α = 0.0−1.5) or [NII] contamination ([NII]λ6583/Hα = 0.0−0.5). Lower panel: distribution of the inferred stellar mass. The black open histogram shows the distribution of all the H II regions.
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