Fig. 4.
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X-ray spectrum of K2-18 analyzed over the 0.2–2.0 keV range, extracted from the PN-CCD (top), MOS1 (middle), and MOS2 (bottom) on XMM-Newton during a 100 ks observation. The solid black line is the spectral model through BXA-Plasma, the dashed orange line is the source model, and the dotted gray line is the background model with PCA routine in BXA.
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