Noise-free residuals in terms of the orbital phase. The level of uncertainties above 15 μs are dimmed in order to describe the trend clearly. The RMS levels are displayed in the upper right corner of each plot. Top: post-fit residuals with fixed h₃ = 0, and η = 1. Notice that some of the Shapiro delay signature is absorbed by Keplerian orbital parameters. However, the Shapiro delay is still prominent. Lower: Post-fit residuals with the best-fit parameters in Table 3. Timing jumps have been applied to each receiver to account for any time offset. The size of the error-bars have been scaled with the corresponding EFAC and EQUAD.