&neither  nor   & 944,802\
1 & but not   & 1,212,271\
2 &both  and  & 1,002,955\
3 & but not   & 3,473\

The average spectra of mask 0, mask 1, and mask 2 regions are shown in Figure \[3masks\_spectra\]. These profiles are valuable for deducing general characteristics of the regions, but it must be kept in mind that the characteristics of the average profile are quite different from those of individual profiles. The difference is primarily due to systematic velocity shifts across the cloud; these result in the average spectra being much weaker and broader than individual spectra. The line width of the averaged mask 1 spectra is close to a factor of 2 greater than the average line width of spectra in this region. For mask 2, the ratio is $\simeq$1.5. Along with this, the peak intensities are much weaker than those seen in individual spectra or even in spectra averaged over a restricted region. Consequently, in determining characteristics of the molecular gas, we have used individual spectra wherever possible to derive physical quantities.

**\[!htbp\] ![image](f3.pdf)**

As expected, the lines are strongest in mask 2. The  to ratio at the line peak in mask 2 is just over 3, consistent 