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Fig. 1

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Upper panel: datasets that compose the spectrum 1 analysis. Black data: XRT spectrum; red data: BAT spectrum; green data: ISGRI spectrum. Lower panels: residuals in units of σ for the continuum models of Table  1; upper mid-panels: only continuum, lower mid-panels: continuum with the addition of a cyclotron absorption feature at  ~ 31 keV.

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