Table 1 Parameter values for the two preferred models of free precession

Viewing angle, ζ (deg)

169.07 ± 0.22

168.50 ^+0.26_-0.21

Initial wobble angle, θ₀ (deg)

19.52 ± 0.38

30.52 ^+0.66_-0.74

Angle between the magnetic and symmetry axis, χ (deg)

173.34 ± 0.13

171.37 ^+0.20_-0.16

Initial phase of the precession, Φ₀ (deg)

45 ⁺⁵_-4

108 ± 3

Constant ellipticity of the NS, ϵ₀

(1.24 ± 0.03) × 10⁻⁷

(9.17 ± 0.14) × 10⁻⁸

Initial ellipticity of the NS, ϵ₁

(2.37 ± 0.05) × 10⁻⁶

(1.58 ± 0.03) × 10⁻⁶

Ellipticity relaxation timescale, τ_ϵ (days)

19.55 ± 0.35

36.43 ± 0.46

Wobble angle decay timescale, τ_θ (days)

74.30 ± 0.26

—

Frictional coupling timescale, τ_c (s)

—

2.49 ± 0.01

Ratio between the moment of inertia of the crust and the core, κ

—

<0.01

Start time of the precession, T₀ (MJD)

58,444.5 ± 0.4

58,444.9 ± 0.5

Initial twist parameter, n₀

0.040 ^+0.008_-0.040

0.062 ^+0.015_-0.062

Twisted magnetic field relaxation timescale, τ_t (days)

>1,500

>1,500