decrease below the detection threshold much more quickly than 850 [$\mu$m]{} emission from the same core, resulting in smaller sizes derived from 350 [$\mu$m]{} data than from 850 [$\mu$m]{} data.

The second possibility is that the method used to obtain these SHARC-II observations might not be sensitive to extended emission. Considering that both the mean and median of the distribution of 2$\sigma$ angular diameters is 32 and that the SHARC-II field of view is 259 $\times$ 097, the observations presented in this work appear to lose sensitivity to extended emission on scales larger than about half the size of the smaller dimension of the array. This is in qualitative agreement with the statement from §\[subobs\] that the Lissajous observing method used for this survey works best for sources with sizes less than or comparable to the size of the array. It also agrees with the findings of Enoch et al. (2006), who showed that their observations of low-mass cores in Perseus with the Bolocam bolometer array at the CSO could not recover extended emission on size scales larger than about half the size of the array, and while the details of the data collection and reduction between Bolocam and SHARC-II 