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\subsection{Excitation Temperature}  {\bf Figure \ref{texcit} illustrates the impact of the assumed excitation temperature on the mass estimate.} We found that there was a systematic bias to overestimate the mass of the outflow. We attribute this to errors in assuming a single temperature of excitation. We examined the simulation data and found that there was significant temperature variation in the data cube and slight temperature variation over time. We followed the same protocol as observers and assumed a single temperature of excitation for each image. However we used a different temperature for each time. These temperatures are shown in table 2. Table \ref{tab_texcit}.  \subsection{Excitation \subsection{Average Simulation Gas  Temperature} \label{tab_texcit}  \begin{center}  \begin{tabular}{c | c}  Time (Myr) & Temperature (K) \\