Fig. 3.
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Top two panels: XMM/RGS + EPIC + NICER spectra and best fit model. The NICER (EPIC) data were ignored between 0.5–1.8(2.6) keV to fully employ the high resolving power of RGS and decrease degeneracy between models of line emission and absorption as well as calibration issues. Bottom two panels: Residuals computed for the models without pion and without pion, ISM ions and dust.
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