module AgwxGrids

are designed for data which is easily maintained as a 3D matrix. The following is 
a typical top part of a Grid file:

7 8 245 [XNo YNo ZNo]

-93.000000 -87.000000  [XStart  XEnd]
42.330002 47.000000  [YStart  YEnd]
121 365 1      [ZStart  ZEnd  ZInc]
-99.000000 0    [BadVal  #Decimal_Places]
121      [ZIndex]
8 10 7 4 4 4 4    [Grid Values]    
7 6 6 4 5 4 4
6 8 8 4 4 4 3
7 8 9 6 4 3 3
8 8 8 6 4 3 2
8 8 6 4 4 2 1
6 6 4 2 2 2 2
4 4 2 2 0 2 2
122
19 21 18 14 14 14 13