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Fig. 1

image

Phase-folded pulse profile of SMC X-3 derived from the best-fit period of 7.7720059. The profile is normalized at an average count rate of 44.49 cts s−1. Red and blue lines correspond to the derived pulse profile for a period shifted by ± 5 × 10−5 s, which is ~1000 times largerthan the derived period uncertainty. This was chosen to demonstrate the accuracy of the derived period. Three peaksare clearly distinguished.

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