Timing residuals using fixed WP template profile of Fig. 4 (black points) and using the Gaussian templates of Fig. B.3 (red open circles). 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. The blue lines show the best linear fits to the residuals of BP1, BP2, and IP, which were used to correct for the linear drifts across those orbital-phase windows (see Fig. A.4). The orbital-phase extent of the lines is equal to the W_3σ value of the corresponding orbital-phase window.