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Fig. 7.

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X-ray spectrum of Cen X-3 ranging from 4–78 keV for the interval g of the second orbit using the Fermi-Dirac cutoff continuum. Panel a: residuals of the best-fitting model. Panel b: residuals of the best model, setting the strength of the 30 keV cyclotron line to zero. Panel c: residuals of the spectral fitting without the CRSF.

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