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Fig. 2.
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Typical PSDs simultaneously observed with HXMT/LE (in black) and HXMT/ME (in red). The PSDs of LE are multiplied by a constant of 20 to avoid overlapping in the figure. The central frequencies of the main QPO and its first harmonic are 2.47 Hz and 4.94 Hz, respectively, as indicated by two dashed blue lines.
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