Residuals of pulsar B for 14 100-day intervals, calculated using the analytic WP template of Fig. 4, constructed from fitting a three-Gaussian-component model to the average WP profile of pulsar B. The weighted RMS of the residuals, calculated over the entire data set shown in this figure, is 9.33 ms; the corresponding value is 75. The red lines correspond to the function of Eq. (9), using the best fit values for the parameter w₀. The shaded envelope corresponds to the 1σ confidence interval of the above function. The horizontal blue error bars indicate the orbital-phase intervals, at the location of peak brightness of BP1, BP2, and IP (centroids), that were used to calculate the average profiles of Fig. B.2; for the WP, the entire width of the orbital-phase window was used. Also, the panel corresponding to the interval MJD53400–54500 shows the extents of the orbital-phase regions, BP1, BP2, the IP, and the WP, for that interval, as red, blue, green, and grey shaded areas.