Table 2 The locations and coordinates of the sampling spots relative to the shearer.

M₁

16 m in front of the rear drum

-16

M₇

10 m behind the rear drum

10

M₂

Front drum

-10

M₈

20 m behind the rear drum

20

M₃

Middle of the shearer

-5

M₉

30 m behind the rear drum

30

M₄

Rear drum

0

M₁₀

50 m behind the rear drum

50

M₅

2 m behind the rear drum

2

M₁₁

100 m behind the rear drum

100

M₆

6 m behind the rear drum

6