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- !0 ID:&E1F85B99
- !4 number of fields in x direction
- !8 number of fields in y direction
- !12 size of a square in millimeter
- !16 size of 1 unit in z direction in millimeter
- !20 start of data default=1024
- s=!!20 first field, x=0,y=0 is left under
- s!3072 second field, x=1,y=0
- etc.
- a field consist of 32 by 32 = 1024 squares
- ?0-?1023 altitudes of the 1024 squares
- ?1024-?3071 colours of the 1024 squares