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Fig. 3

image

Power spectrum of X-ray observations of GX 1+4 (black lines). The solid red line represents orbital period of 1160.8 d (Hinkle et al. 2006). Dashed green line represent proposed period of 303.8 d (Pereira et al. 1999). Blue dashed-dotted line represents the 59 d period reported by Majczyna et al. (2015). The gray line represents the limit of a significant detection (see text).

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