deletions | additions       diff --git a/scattering part2.tex b/scattering part2.tex  index 8ce0c5a..ea0837a 100644  --- a/scattering part2.tex  +++ b/scattering part2.tex 
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\end{equation}  where $\tau_s$ is the scattering time in ms and $\nu$ is the observing frequency in GHz. The scatter of measured values about this relation ship has a standard deviation of several orders of magnitude. In the remainder of this document we take a conservative approach and assume scattering times 4 orders of magnitude smaller than those suggested by the above relation, i.e. the best-case scattering. As we will see, this approach results in reasonable requirements on the SKA1 pulsar timing instrumentation.