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Table 2 Stem-quality classification based on tree crookedness in SNFI-4 plots

From: Improving stem quality assessment based on national forest inventory data: an approach applied to Spanish forests

Crookedness quality (QC)

Single crook

Multiple crooks

1

 < 2 cm/m

Not allowed

2

 ≤ 2.6 cm/m

 ≤ 1 cm/m

3

Allowed

 ≤ 2 cm/m

4

Allowed

Allowed