deletions | additions       diff --git a/considerations.tex b/considerations.tex  index 4371736..70e8d1f 100644  --- a/considerations.tex  +++ b/considerations.tex 
...
Ideally the upper DM limit for each band should be defined by the top frequency of that band. While practically speaking this is feasible for SKA1\_Mid, the large amount of memory required to do this across the whole SKA1\_Low band ($>100$ GB) is restrictive and would have unnecessary cost implications for pulsar timing with the SKA. We therefore suggest that for SKA1\_Low, the maximum DM required to be supported should be defined by equations \ref{eqn:limiting_dm} and \ref{eqn:limiting_dm_p} with the value of $\nu$ set by the bottom frequency of the observing band. For SKA1\_Mid we suggest that the maximum DM to be supported by each frequency band is given by equations \ref{eqn:limiting_dm} and \ref{eqn:limiting_dm_p} with the value of $\nu$ set by the highest frequency in the band. For both SKA1\_Low and SKA1\_Mid, the value of $n_{\rm bins}$ will be user defined on a per-observation basis. This leads to two new requirements for pulsar timing with SKA1:  \begin{itemize}  \item \textbf{SKA1-SYS\_REQ-XXXX:} \textit{\bf SKA1\_Mid Pulsar Timing coherent dedispersion DM limits.} The SKA1\_Mid when in pulsar timing mode shall time pulsars using coherent dedispersion perform phase-coherent dispersion removal  up to a dispersion measure defined by:\\ $\log_{10}{\rm DM}= \frac{1}{2.14}(-0.154 + \sqrt{0.0247 + 4.28(13.46+3.86\log_{10}{\nu}+\log_{10}{t_{\rm res}})}$,\\ where the frequency ($\nu$) is defined as the top of the current observing band and the time resolution ($t_{\rm res}$) is defined by SKA1-SYS\_REQ-2961.   \item \textbf{SKA1-SYS\_REQ-XXXX:} \textit{\bf SKA1\_Low Pulsar Timing coherent dedispersion DM limits.} The SKA1\_Low when in pulsar timing mode shall time pulsars using coherent dedispersion perform phase-coherent dispersion removal  up to a dispersion measure defined by:\\ $\log_{10}{\rm DM}= \frac{1}{2.14}(-0.154 + \sqrt{0.0247 + 4.28(13.46+3.86\log_{10}{\nu}+\log_{10}{t_{\rm res}})}$,\\  where the frequency ($\nu$) is defined as the bottom of the selected SKA1\_Low observing bandwidth and the time resolution ($t_{\rm res}$) is defined by SKA1-SYS\_REQ-2962.  \end{itemize} 
...