Table 3.

Cutting accuracy.

		Actual number of node/pcs			Number of node cut/pcs
Number of groups	Normal	Damaged	With mud blocks	Normal	Damaged	With mud blocks	Rate of node recognition/%
1	78	1	1	78	1	1	98.75
2	81	0	0	81	0	0	100
3	77	0	1	77	0	0	98.71
4	84	1	0	84	0	0	98.82
5	83	1	2	83	1	1	98.83
6	76	2	2	76	0	1	96.52
7	80	1	0	80	0	0	98.76
8	79	0	0	79	0	0	100
9	82	0	2	82	0	1	98.80
10	77	1	1	77	0	0	97.46