deletions | additions       diff --git a/Scattering times.tex b/Scattering times.tex  index f34b576..303f62c 100644  --- a/Scattering times.tex  +++ b/Scattering times.tex 
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The point at which the scattering timescale exceeds the timescale implied by new versions of SKA1-SYS\_REQ-2961 and SKA1-SYS\_REQ-2962 (see above) ultimately determines the maximum DM for which the SKA1 pulsar timing instrumentation must support phase-coherent dispersion removal. Beyond this DM, the computational cost of coherent dedispersion can be decreased by trading time resolution for frequency resolution.  By rearranging equation \ref{eqn:best_case_scattering} we can determine the limiting DM (DM$_{\rm limit}$) above which it is no longer possible to achieve a given timing resolution ($t_{\rm res}$) due to scattering:  \begin{equation}  \label{eqn:limiting_dm}  \log_{10}{\rm DM_{\rm limit}} = \frac{1}{2.14}(-0.154 + \sqrt{0.0247 + 4.28(13.46+3.86\log_{10}{\nu}+\log_{10}{t_{\rm res}})}.  \end{equation}  Here $t_{\rm res}$ has units of seconds and $\nu$ has units of GHz.