TABLE 1
Parameters for pulsar timing models used in this study (where MJD is Modified Julian Day)
| Pulsar name |  |  |  (× 10–14Hz/s) | σP(μS) |
|---|---|---|---|---|
| B1937+21 | 55,000 | 641.9 | –4.3 | 1.5 |
| B1821-24 | 55,000 | 327.4 | –17 | 1.83 |
| J0218+4232 | 55,000 | 430.5 | –1.5 | 7.82 |
| J0437-4715 | 55,000 | 173.7 | –0.17 | 1.0 |