Sreath S≤1㎡ 1㎡ 3㎡ 5㎡ 10 ceum 30 ceum 50 ceum 100 ceum 300 ㎡ <S 2 Sreathan 4 7 7 8 8 9 10 12 RFQ 4 Sreathan 5 8 8 9 9 10 11 13 6 Sreathan 6 9 9 10 10 11 12 14 8 Sreathan 7 10 10 11 11 12 13 15 10 Sreathan 8 11 11 12 12 13 14 16 12 Sreathan 9 12 12 13 13 14 15 17 ≧14 sreathan RFQ