Fig. 3
Best-fit X-ray temperatures as functions of the hydrogen column density for T Dra (squares), R UMa (dots), and Mira (triangles). The 90% confidence range is indicated by the flat-tipped error bars, while an unconstrained value is indicated by the arrow-tipped error bars. The behavior of the fits reflects the limitations of ROSAT spectra for hard and low count rate sources.
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