These files are METEOSAT observations to give cloud classification
data.  The file naming convention is:
       
              cxDDMMYYsxx.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: I1 pixels, 188 pixels/row, 163 rows.  Each pixel
has a spatial resolution of 0.08 degrees.

The cloud type (1-15) is coded on the four Most Significant Bits.
This code is:

                 1        -clear
                 2,3      -cloud edges
                 4        -thin cirrus
                 5,6      -thick cirrus
                 7        -perturbation
                 8,9,10   -low cumuliform
                 11,12    -low stratiform
                 13,14,15 -medium