0 0 CIRCULAR
1 1 ELLIPTICAL - THE MINOR AXIS IS AT LEAST 3/4 THE LENGTH OF THE MAJOR AXIS
2 2 ELLIPTICAL - THE MINOR AXIS IS LESS THAN 3/4 THE LENGTH OF THE MAJOR AXIS
3 3 APPARENT DOUBLE EYE
4 4 OTHER SHAPE
5 5 ILL DEFINED
6 6 UNDETERMINED
7 7 MISSING VALUE
