Dn4000 index distributions for the red, green, and blue [NeV] emitters plotted as filled coloured histograms (from top to bottom panels, respectively). The dashed, grey histograms represent the control samples of each population. The median Dn4000 value for each class is overplotted (solid coloured line for the [NeV] emitters and dashed grey line for the comparison samples). The errorbars plotted at the top of the vertical lines represent the median standard deviation of each distribution. The [NeV] emitters of the green valley and those of the blue cloud have younger underlying stellar populations compared to their parent populations.
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