Upper panel: histogram of the distribution of the residuals with respect to the weighted average of each star, in unit of the associated error (Eq. (1)). Overplotted to the histogram, a Gaussian with σ = 0.96 and centered in 0.01 is shown. Lower panel: probability plot of the same residuals of the upper panel. The straight line, with intercept 0.01 and slope 0.96, indicates the least squares fit of the data.
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