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. Author manuscript; available in PMC: 2020 Nov 3.
Published in final edited form as: Mon Not R Astron Soc. 2020 Sep 1;498(4):4605–4614. doi: 10.1093/mnras/staa2640

Figure 4.

Figure 4.

Evolution of the spin frequency time derivative v̇ of PSR J0537–6910. NICER values are measured by fitting a timing model to TOAs in each segment (see Table 1). RXTE values are from Table 1 of Antonopoulou et al. (2018). Errors are 1σ uncertainty. Dashed line shows a linear fit of NICER and RXTE data with best-fit v̈ = −8.00 × 10−22 Hz s−2. Vertical dotted lines denote the start (MJD 57722, 2016 November 30) and end (MJD 57990, 2017 August 25) of the second observing run (O2) and start (MJD 58574, 2019 April 1) and end (MJD 58935, 2020 March 27) of the third observing run (O3) of LIGO/Virgo.