Fig. 4
AO9 pn light curve, folded at P ~ 18.6 ms (the epoch of phase zero is defined at T0 = MJD 5536.00884 days). The energy band is 0.36−2.25 keV and the size of the extraction region is 18.6′′. Two cycles are shown for clarity. The best-fit sinusoidal function is also shown (dashed line).
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