Table 3 Adsorption parameters of coal samples.

Excavation distance(mm)	Q (cm³/g)	a (ml/g)	b (MPa^-1)	R²
300 ~ 400	10.514	13.808	0.812	0.998
400 ~ 500	10.140	13.227	0.857	0.999
500 ~ 600	10.658	14.584	0.672	0.998
600 ~ 700	11.190	14.721	0.842	0.999
700 ~ 800	10.967	14.097	0.930	0.999
800 ~ 900	10.866	13.938	0.932	0.999
900 ~ 1000	13.405	18.118	0.753	0.999
1000 ~ 1100	13.903	17.302	1.094	0.999
1100 ~ 1200	13.743	18.443	0.819	0.995
1200 ~ 1300	13.766	18.330	0.795	0.999
1300 ~ 1400	15.718	20.001	0.936	0.999
1400 ~ 1500	18.987	23.564	0.511	0.993

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