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\end{equation}  (Bourke et al. 1997)  We examined the simulation data to determine values to use for the temperature of excitation. we found that the temperature varied significantly over the data cube but that the majority of the mass was at ~12K. We followed the same protocol as observers and assumed a single temperature of excitation for each time. These temperatures are shown in figure table  2. we find that there was a systematic bias in overesimating the mass which we attribute to the imprecision of calculating mass from an average temperature. This is shown in figure 3 2