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Fig. 7
Histogram of the ⟨ Nz ⟩ values calculated from Balmer lines, and normalised to the error bars σ ⟨ Nz ⟩ . The red solid lines show the Gaussian with σ = 1, and the blue solid line a Gaussian with σ = 1.365, both with the same areas as the observed distribution. The vertical lines mark the limits at − 3 and 3.
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