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Fig. 2

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Evolution of the pulse phase delays (in μs) during the August 2008 outburst obtained by folding around the best estimate of the spin frequency at the beginning of that outburst,  Hz, the time series preliminarily corrected with the orbital solution listed in the left column of Table 1. The solid line is the best-fit quadratic model, while dashed lines mark the 1σ confidence-level intervals. The bottom panel shows residuals with respect to a model that also includes the spin up term.

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