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Fig. 1.
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∼13-year long-term MAXI/GSC light curve of Vela X−1 with a bin size of one orbital period. The red, green, and blue arrows mark the low (< 0.36 counts s−1), mid (0.36−0.46 counts s−1), and high (> 0.46 counts s−1) intensity levels. The horizontal lines (cyan) separate the three intensity levels.
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