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Table 1 Structure of the analysed data set of timber production processed by the CTL method – distribution of stems into diameter classes according to stem volume, frequency and ratio of the group to the whole sample. Distinguishes trees where the last cut was made above and below the threshold diameter of 7 cm, which affects the reported timber volume 

From: How much timber from Norway spruce (Picea abies L.) is left on the harvesting site as treetops? A study on scaling and grading yields of harvesters

Diameter class

Stem volume with the top end diameter

Number of stems with the top end diameter

Share of diameter class according to volume

Share of diameter class according to number

 ≥ 7 cm

 < 7 cm

 ≥ 7 cm

 < 7 cm

 ≥ 7 cm

 < 7 cm

 ≥ 7 cm

 < 7 cm

[m3]

[pcs]

[%]

1

2

3

4

5

6

7

8

9

10

4.27

9.97

74

192

0.15

0.35

0.67

1.74

12

22.46

49.59

282

698

0.80

1.76

2.56

6.34

14

60.93

99.42

563

995

2.16

3.52

5.11

9.04

16

92.81

141.63

647

1031

3.29

5.02

5.88

9.37

18

120.77

169.33

624

912

4.28

6.00

5.67

8.28

20

158.31

181.87

634

725

5.61

6.44

5.76

6.59

22

176.20

181.99

547

562

6.24

6.45

4.97

5.10

24

187.67

155.12

454

396

6.65

5.49

4.12

3.60

26

194.91

155.14

385

306

6.90

5.49

3.50

2.78

28

192.46

108.09

295

184

6.82

3.83

2.68

1.67

30

152.23

67.71

212

100

5.39

2.40

1.93

0.91

32

68.48

32.16

91

47

2.43

1.14

0.83

0.43

34

31.81

8.31

40

13

1.13

0.29

0.36

0.12

Total

1463.32

1360.35

4848

6161

51.82

48.18

44.04

55.96