Same as Fig. 4 but for PSRs J0023+0923, J0610−2100, J0636+5128, J1124−3653, J1513−2550 and J1544+4937. We note that in this figure S/N histograms and corresponding axes are shown in blue. TOA residuals are shown as red and black dots. Red dots correspond to observations with S/N values among the 25% lowest. Dashed vertical lines indicate superior conjunction, corresponding to orbital phase 0.25. In some plots the error bars are too small to be apparent.