(black points) Timing residuals using Gaussian templates of Fig. B.3 and after correcting for the linear drifts across each orbital-phase window, via the best fits shown in Fig. A.2. For comparison, light grey circles show the timing residuals using the fixed WP template profile of Fig. 4. For each data set, the weighted RMS and the corresponding , calculated over the entire data set shown in this figure, is shown in the top-right corner of the top-left sub-plot.