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Fig. 9.

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Significant correlation of T10+S23 sample. Δαox versus ξ for the UFOs sources. The S23 UFO sub-sample is shown in red circles and the T10 in blue diamonds. The C21 sub-sample is shown with light black squares as, if considered, the correlation is not significant. The solid line represents the best-fitting linear correlation and the dark and light gray shadowed areas indicate the 68% and 90% confidence bands, respectively. In the legend, we report the best-fit coefficients, logNHP and the intrinsic scatter for the T10+S23 sample.

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