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Figure 3 shows how the sound velocities change with temperature at saturated vapor pressure. This graph is of fundamental importance in this lab and it will be attempted to be recreated with the data.   \subsection{First Sound}  For first sound it can be seen from figure 3 that there is a slow decrease in $C_1$ from T=0 onward except at the $\lambda$ point where there is a acusp due to theromodynamic behovior close to a transition temperature [1]. First sound also experiences attenuation peaks at $T_\lambda$ and near 1 K.   \subsection{Second Sound}