,Diameter (mm),,,,,,,,
Grade I copies,28,27,26,25,24,23,22,21,20
Period 3,,,1,1,,,,,
Period 5,,,,1,,1,,,
Period 6,1,1,3,1,1,,,,
Period 7,,1,,,,,,,
Period 12,,,,1,,,,,
Period 18,,2,,,,,,,
Period 35,,1,1,,,,,,
Period 36,,,1,,,,,,
,,,,,,,,,
Grade II copies ,,,,,,,,,
Period 2,,,1,1,,,,,
Period 3,,2,1,3,2,,,,
Period 5,,,1,,1,,1,,
Period 6,2,1,3,6,3,1,1,1,
Period 7,1,1,2,,1,1,,,1
Period 12,,,1,1,,,,,
Period 18,,,,1,1,,,,
Period 22,,,1,,,,,,
Period 31,,,,1,,,,,
Period 32,,,,,1,,,,
Period 35,,,,2,,,,,1
,,,,,,,,,
Grade III copies  ,,,,,,,,,
Period 3,,,,,,,1,,
Period 5,,,,,,,1,2,
Period 6,,1,,1,1,3,1,,
Period 7,,,,,,,1,,
Period 8,,,,,,,1,,
Period 12,,,1,,1,,,,
Period 18,,,,1,1,,,1,1
Period 22,,,,1,,,,,
Unstrat.,,,,,1,,,,