Notes. The top part of the table reports the measured timing parameters. From top to bottom we list: right ascension (α), declination (δ), proper motion in α and δ, parallax (ϖ), epoch of the reported position, spin frequency (f), spin frequency derivative, epoch of the reported f, dispersion measure (DM taken from the best detection obtained at 800 MHz at MeerKAT), binary model used (Hobbs et al. 2006), orbital period (P_b), projected semi-major axis (x), time of the ascending node (T_asc), four orbital frequency derivatives and the Tempo2 rms of the timing residuals. Position, proper motion and parallax are taken from Gaia DR3 (Gaia Collaboration 2023). For each parameter, the (Gaia or timing) one-sigma error on the last quoted digit(s) is reported in parenthesis. The hyperparameters of the orbital-phase-covariance function are the amplitude, h, the length scale, ℓ, and the Matérn degree, ν. Their values are reported with 95% confidence intervals. The bottom part of the table lists the derived parameters. Top to bottom: spin period, intrinsic spin period derivative Ṗ_int corrected for the Shklovskii and Galactic potential effects, spin-down power and surface magnetic field (calculated using the corrected Ṗ_int), minimum companion mass (assuming a neutron star mass of 1.4 M_⊙), DM-derived distances (using the NE2001 and YMW16 models), total proper motion and transverse velocity, using the NE2001 DM-derived distance and estimate of the 1300-MHz flux density. The full ephemeris for J1803−6707 is available as supplementary material on Zenodo (see Data availability section).