Figure 3 shows the water vapor content measured on Plateau de Bure
between Nov 5 and Nov 7 (the various curves correspond to the
different antennas). Very low water vapor content (less than 0.7 mm)
persisted when the outside temperature was about 
C. With the
upcoming of warmer air (about 0 degrees), the water vapor content
increased to about 3 mm.
Water vapor content well below 2mm is expected to occur frequently
in winter, since the mean outside temperature is 
C.
Figure 3: Water vapor content measured on Plateau de Bure
between Nov 5 and Nov 7 (see text)