Left: second time derivative of the residual phase R_s(t), a third-order spline fit through phase residuals from Table T. The orange vertical lines are drawn at dates of reported glitches and labeled according to Table A.1. Episodes are shaded intermittently as light gray and white. Right: phase residuals as a function of time for a short interval during episode 3. The red line shows R_s(t), while the blue line is calculated as suggested by explanatory notes of JBE (see text for details). Error bars show JBE quoted arrival-time uncertainties.