Fig. 1

Result of using TEMPO2 on all data with the parameters given in Table 1 of Backer et al. (2000) as constant input (i.e., without any fitting). The lone BeppoSAX data point is at epoch ≈–21 days with a larger error bar. We note that no artificial phase jumps (using PHASE ±1 in the input file to TEMPO2) are required, pointing to the robustness of the radio reference timing model used.
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