Fig. B.1
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Confidence maps for atmospheric parameters derived from spectroscopy. Examples are selected to cover different spectral types. The contour lines refer to single parameter uncertainties of 68% (red contour) and 99.7% (black contour), respectively. Top row: He-poor sdB/O stars. The cool sdB, HS2218+0201 (correlation coefficient r=0.73), the sdOB star HS1806+5024 (r=0.36), and the hot sdO HS2123+0045(r = −0.52) are shown. Bottom row: He-rich sdOs. iHe sdO HS1832+6955 (r=0.37), eHe sdOB HS1843+6343 (r=0.70), and eHe sdO HS1638+6733 (r=0.56) are shown.
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