Post-fit residuals (time of arrival—best-fit model) for the TOAs and timing solution of PSR J1411+2551. Top: residuals displayed vs. epoch. Bottom: residuals vs. orbital phase. The black residuals correspond to the incoherent search mode data at 327 MHz, the blue ones to the coherently dedispersed data at 327 MHz and the red to the coherently dedispersed data at L band. All data were taken with PUPPI. No significant trends are detectable in the residuals, showing that the ephemeris in Table 1 provides a good description of the data.