Joint 2D probability-density map of the period (in 10³ days) of the sinusoidal functions that were fit to the locations of BP1 and BP2 as a function of time (see Fig. 17). The median and 1σ uncertainties of the period of geodetic precession period of pulsar B, published by Breton et al. (2008), is shown with a filled red circle with error bars. The star symbol corresponds to the most likely values of the periods from our analysis. Finally, the empty circle corresponds to the period of geodetic precession predicted by GR.