Total kinematic contribution to the observed orbital decay, Ṗ_b,gal, shown as a function of distance to the pulsar in the blue curve. The red, orange, and green curves represent individual contributions due to galactic disk acceleration, galactic rotation (or differential) acceleration, and proper motion of the pulsar, respectively, with errors in R₀ and θ₀ providing negligible contributions. The vertical black line marks the DM distance from the NE2001 model. The 20% uncertainty in the model is shown as dashed black lines. Grey lines show an estimate of the DM distance from the YMW16 model. The maximum uncertainty in total kinematic contribution is 5.1 fs s⁻¹.