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\end{itemize}  In the case of the SKA1\_Low DM limits, we assume that users will have the capability to select a specific frequency range for observations, e.g. if the observation band is selected to be 150-350 MHz, then the limiting DM will be defined by a frequency of 150 MHz.   Above the DM limits set by the above requirements we suggest that the pulsar timing instrumentation of SKA1 supports semi-coherent and  incoherent dedispersion out to considerably higher dispersion measures. Semi-coherent dedispersion here refers to the process of partially removing dispersive smear coherently such that there is a reduced residual dispersive smear per channel after incoherent dedispersion. The DM limits for incoherent dedispersion with SKA1 should be of the order 3000 pc cm$^{-3}$ for SKA1\_Low and 6000, 10000 and 100000 pc cm$^{-3}$ for SKA1\_Mid bands 1, 2 and 5.