Fig. 2
a) Periodogram of Swift-BAT (15–60 keV) data for AX
J1820.5–1434. b) Light curve folded at a period
P0 = 54.0 d with 16 phase bins. The arrows mark the
orbital phase of the Swift-XRT and XMM-Newton
observations. c) Histogram distribution of the
values; the
solid line is the exponential function that best fits the right tail of the
distribution.
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