Probability density function (PDF) of the logarithm of TOA uncertainties, σ_TOA (in μs), from the cross-correlation of all of the original data profiles (after RFI excision) with the WP template profile of Fig. 4. The solid, dashed, and dashed-dotted vertical lines correspond to the median, the 68%, and 95% confidence intervals of the distribution, respectively. The unshaded area of the histogram corresponds to the range of uncertainties (σ_TOA >  9.3 ms) corresponding to TOAs that were excluded from further analysis.