Fig. 2.
Variation of ν and 
as a function of epoch. Dots are data from the JBCPME (Lyne et al. 1993), while the boxes are NICER data. The change in rotation frequency Δν (top panel) and the change in the frequency derivative 
(bottom panel) are measured with respect to the preglitch reference timing model obtained from the preglitch JBCPME data.
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