Timing residuals across epochs (top) and orbital phase (bottom). Data include historic Parkes ToAs (green and purple; PKS Multibeam CPSR2 1341 MHz and 1405 MHz) recent and historic Parkes CASPSR data (red; PKS Multibeam CASPSR), as well as recent Parkes UWL/Medusa ToAs (blue; PKS UWL Medusa) and MeerKAT L-band ToAs (gold; MKT L/1K PTUSE). Top: after applying the best-fit values as obtained using the timing and noise model described in Sect. 2.5, we obtain a weighted rms of 1.259 μs. Bottom: residuals as a function of orbital phase, measured from superior conjunction (the ascending node is at a phase of −0.25). A Shapiro delay signal is discernible when setting the companion mass to zero (M_c = 0) while keeping all other parameters fixed, including x_p sin i. We overplot the expected theoretical signal based on the best-fit inclination and companion mass values in black. The line width indicates combined 1σ deviations in companion mass and inclination angle.