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Figure 24: The fractional stability of three millisecond pulsars compared to an atomic clock. Both PSRs B1855+09 and B1937+21 are comparable, or just slightly worse than, the atomic clock behaviour over timescales of a few years [257]. More recent timing of the millisecond pulsar J0437–4715 [389] indicates that it is inherently a very stable clock. Data for the latter pulsar provided by Joris Verbiest. |