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\section{Interstellar \section{Limits from  Multipath Scattering Limits} Scattering}  In all discussions of the achievable and required timing resolution for SKA1\_MID and SKA1\_LOW, we must consider physical limitations imposed by propagation effects in the interstellar medium (ISM). While the use of coherent dedispersion will remove the frequency dispersion caused by the ISM down to the Nyquist limit, multi-path scattering ultimately places a physical limit on the minimum resolvable structure in a given pulsar's pulse profile (and therefore minimum possible timing resolution).  
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