These files are the calculated downward longwave flux at the
surface derived from METEOSAT observations. The file naming 
convention is:
       
              raDDMMYYsxx.fis_tmp

where DDMMYY is the date and xx = "slot number"
Mean time (UT) is obtained from the slot number over 
the ASTEX region by the formula: 

                  UT = (xx/2) - 0.17


These files are: I2 pixels, 188 pixels/row, 163 rows.  Each pixel
has a spatial resolution of 0.08 degrees.

The units of flux are Wm^-2.