Fig. 3
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Distribution of parallax uncertainties as a function of parallax. The dot-dashed and dashed lines mark the 10% and 25% uncertainty levels, respectively. HS0941+4649 and HS1000+4704 are off the scale; their parallax uncertainties are larger than the parallax. He-poor stars are shown in blue, iHe rich ones in black, and eHe-rich in red.
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