Fig. 2
Temperature and hydrogen column density of the ism-model versus the 0.5−2 keV unabsorbed flux for each dataset using the C-statistic fitting model. The horizontal red line represents the inverse-variance-weighted average and the coloured band indicates the 3σ confidence band. Only RGS 008411 (the observation with a flux ~2.2 × 10−9 erg cm−2 s−1) shows a deviating column density value.
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