Fig. 1
Upper panel: OGLE-IV I-band light curve. Dashed lines indicate the time of optical spectroscopy observations. Middle panel: X-ray fluxes in the (0.2−10.0) keV band from Swift (open squares) and XMM-Newton (open circles) including the 2009 slew-survey data and the 2010 measurements. Lower panel: NS spin period as measured with XMM-Newton.
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