Fig. 6.
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Uncertainties for the different samples. Left panel: open and filled squares represent the error and offset of the same sample of stars, but with different observational frequencies. The plus signs represent uncertainties. Middle panel: open and filled circles represent the error and offset of the same observational frequencies sample of stars, but with different sample sizes. The plus signs represent uncertainties. Right panel: open and filled triangles represent the error and offset of the actual samples. The uncertainties are not shown because they have the same values as the errors.
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