Structure of the attributes
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The first digit indicates the dominant Smax class (60% of the cell). The second digit indicates the associated (40% of the cell) class.  When the second number is 0, this indicates that the whole cell is made up by the Smax class indicated by the first number.  

Easily available water
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The classes are:
      1: Wetlands 
      2: > 120 mm/m
      3: 100 - 120 mm/m
      4: 60 - 100 mm/m
      5: 40 - 60 mm/m
      6: 20 - 40 mm/m
      7: < 20 mm/m
      97:Water
      99:Glaciers, Rock, Shifting sand, Missing data
