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\item \textbf{SKA1-SYS\_REQ-XXXX:} \textit{\bf SKA1\_Low Pulsar Timing incoherent dedispersion DM limits.} The SKA1\_Low when in pulsar timing mode shall time pulsars using incoherent dedispersion up to a dispersion measure of 1,000 pc cm$^{-3}$.  \end{itemize}  \begin{itemize}  \item \textbf{SKA1-SYS\_REQ-XXXX:} \textit{\bf SKA1\_Mid Pulsar Timing incoherent dedispersion DM limits.} The SKA1\_Mid when in pulsar timing mode shall time pulsars using incoherent dedispersion up to a dispersion measure defined by ${\rm DM} = t_{\rm res}(4.15\times10^3 (\nu^{-2} - (\nu+20\ {\rm Hz})^{-2}) )^{-1}$ pc cm$^{-3}$. Where $\nu$ is the bottom frequency of the current observing band and $\t_{\rm res}$ is a user-defined effective time resolution.  \item \textbf{SKA1-SYS\_REQ-XXXX:} \textit{\bf SKA1\_Low Pulsar Timing incoherent dedispersion DM limits.} The SKA1\_Mid when in pulsar timing mode shall time pulsars using incoherent dedispersion up to a dispersion measure defined by ${\rm DM} = t_{\rm res}(4.15\times10^3 (\nu^{-2} - (\nu+1\ {\rm Hz})^{-2}) )^{-1}$ pc cm$^{-3}$. Where $\nu$ is the bottom frequency of the current observing band and $\t_{\rm res}$ is a user-defined effective time resolution.  \end{itemize