Fig. 3
a) Periodogram of Swift-BAT (15−45 keV) data for IGR J015712−7259. b) Histogram of the z (χ2 − Fχ2) distribution. The continuous line represents the best fit exponential model for z > 20. c) Swift-BAT light curve folded at a period Po = 35.6 d, with 16 phase bins. Two orbital cycles are shown for clarity. The phase relevant to the epoch of each XRT observation is shown with a vertical arrow.
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