deletions | additions       diff --git a/scattering part2.tex b/scattering part2.tex  index 680efdd..54204bc 100644  --- a/scattering part2.tex  +++ b/scattering part2.tex 
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The scattering time scale timescale  is roughly related to the observing frequency, $\nu$, and distance between pulsar and observer, $D$, by \begin{equation}  \tau_s \propto \frac{D^2}{\nu^\alpha}  \end{equation} 
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\log_{10} \tau_{s_{\rm best}} = -13.46 + 0.154 \log_{10} {\rm DM}+ 1.07 (\log_{10} {\rm DM})^2 - 3.86 \log_{10}{\nu}.  \end{equation}  As we will see, this approach results in reasonable requirements on the SKA1 pulsar timing instrumentation.