deletions | additions       diff --git a/Payam.tex b/Payam.tex  index a12307b..838bf10 100644  --- a/Payam.tex  +++ b/Payam.tex 
...
\item Sound speed shouldn't depend on viscosity at except for near-supersonic flow. (\href{http://iopscience.iop.org/0370-1301/66/5/303/pdf/0370-1301_66_5_303.pdf}{Or does it?} \href{http://www.engineeringtoolbox.com/sound-speed-water-d_598.html}{Speed of sound table}, \href{http://resource.npl.co.uk/acoustics/techguides/soundpurewater/content.html#LUBBERS}{$c(T,P)$ fits}.)  \item \citet{http://adsabs.harvard.edu/abs/1995PhyA..214..185E},   \citet{10.1103/PhysRevE.51.803},   \citet{10.1103/PhysRevE.56.2950},   \citet{1993PhRvL..70..242K}  \end{itemize}  \item Payam has (equation 12) $v_{\rm DNA}=F_{\rm ext} \ln(\ell/d)/\eta\ell - \lambda E\ln(1+r_{\rm D}/d)/\eta$, which we use to calculate $t_{\rm D}$. He finds $t_{\rm D}\sim \ell\eta/E\lambda$ -- whence this simplification?