Constraints on the orbital inclination angle, masses of the pulsar and the companion, and the Ṗ_b deviation from the measurement and the prediction of GR (ΔṖ_b). The black, grey, and light grey contours represent the 1-σ, 2-σ, and 3-σ confidence levels of these parameters. We show the probability density of each parameter on the upper and right edges, where the grey area and solid grey line represent the 1-σ confidence area and the nominal values; the dashed lines at the edges represent the ±1-σ limits.