RI = 1.40 - 1.52: 1
RI = 1.33 - 1.40: 2
RI = 1.33 - 1.52: 3
RI = 1.33 - 1.56: 4
RI = 1.33 5
RI = 1.56: 6
RI = 1.52: 7
RI = 1.40: 8
RI = 1.44 - 1.50: 9