Differences between timing residuals of PSR J1744−1134 for the TOA datasets described in Sect. 3.2, and those for the “Cal. + corr. MTM” TOA dataset, as a function of time. In all cases, the residuals were determined using an ephemeris for the pulsar obtained by analyzing the “Cal. + corr. MTM” dataset with TEMPO2. Colored symbols represent the residual differences, and black dots show averages over 30-d sliding windows.