Table 4 The selected features for 6-classes classification

slp01a

1 2 4 15 17

slp01b

1 3 4 6 8 9 13 14 15 16 18

slp02a

2 3 6 7 8 11 14 15 16 18

slp02b

2 3 6 8 9 10 11 14

slp03

1 7 9 10 12 14 15

slp04

6 7 8 11 13 14 15 16 18

slp14

1 2 3 10 12 13 14 16 17 18

slp16

1 2 4 8 9 10 11 12 14 15 17 18

slp32

3 4 6 7 10 14 16 18

slp37

1 3 5 7 8 11 14 16

slp41

2 3 5 6 8 10 13 14 17

slp45

2 4 6 7 8 9 10 11 13 14 15 17 18

slp48

1 2 3 4 6 8 10 12 13 14 15 16

slp59

2 3 4 8 12 13 17 18

slp60

1 4 7 8 9 13

slp61

3 5 6 8 17 18

slp66

2 4 7 11 12 13 14 16 18

slp67x

2 4 5 6 9 12 15