deletions | additions       diff --git a/figures/IPU/caption.tex b/figures/IPU/caption.tex  index f6875fe..857ce44 100644  --- a/figures/IPU/caption.tex  +++ b/figures/IPU/caption.tex 
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Plots \textbf{Figure 2.} Plot  of the mutual information of the separated changes in pressure for the forward and backward waves as a function of wave speed. On the left is the result using the whole of the The  measured data $P$ and $U$. On $U$ shown to  the right is the result using only the ensemble average data $pe$ and $ue$. In both figures in Figure 1 were used in  the calculation. The  vertical dashed line represents the wave speed calculatedfrom  using the sum-of-squares method $c_{ss}$, assuming that $\rho = 1040 kg/m^3$. The horizontal dashed line at the bottomof each figure  represents the mutual information of the pressure and the velocity $I(dP,dU)$  that were used to calculate the forward and backward changes in pressure. The short dashed line at the top left indicates the mutual information of the pressure alone $I(dP,dP)$  and the short dashed line to the right indicates the mutual information of the velocity alone. alone $I(dU,dU).  The dots on the continuous line indicate the values of $c$ for which mutual information wasactually  calculated.