Table 1 Puerariae Thomsonii Radix (PTR) samples collected in this study.

From: Identification of growth years for Puerariae Thomsonii Radix based on hyperspectral imaging technology and deep learning algorithm

Growth years

The number of PTRs

The number of outer surface samples

The number of cross-section samples

One year old

24

42

460

Two years old

26

39

437

Three years old

25

39

453

Total

75

120

1350

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