Table 1. Infrared channel characteristics of the VAS

                 Pressure
Channel        level (hPa)(a)          Wavelength (m)          Absorption band
-------        --------------          --------------           ---------------
   1                 65                    14.730                     
   2                100                    14.480                     
   3                325                    14.250                      
   4                450                    14.010                     
   5              SURFACE                  13.330                   /
   6                700                     4.525                       
   7              SURFACE                  12.660                      
   8              SURFACE                  11.170                   WINDOW
   9                375                     7.261                      
  10                330                     6.725                      
  11                280                     4.444                   /
  12              SURFACE                   3.945                   WINDOW

(a)  Level of maximum weighting function for the spectral band. Note that
     this changes with the temperature and humidity profile of the atmosphere
     being measured.