Fig. 8.
Distribution of energy and strength of the best-fit CRSF found in a Monte Carlo simulation of 20 000 fake spectra that do not include a CRSF. Statistical fluctuations will lead to artificial absorption features, fitted with a gabs model. We determine a 4σ detection limit of 0.15 keV on the strength of a significant CRSF detection. 7% of the fits are above the phase-averaged 90% CL upper limit strength of 0.07 keV.
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