Variable	Linguistic value	Before adjustment				After adjustment
Variable	Linguistic value	1	2	3	4	1	2	3	4
Gradient	Low	0	0	0	0.25	0	0	0	0.18
	Medium	0	0.25	0.25	0.5	0.14	0.26	0.26	0.52
	High	0.25	0.5	0.5	0.65	0	0.47	0.47	0.75
	Very high	0.5	0.65	1.02	1.5	0.52	0.91	0.91	1.47
Skin	Stimulated	−10	−10	−10	0	−10	−10	−10	−2.4
	Undamaged	−10	0	0	2.5	−10	−6.3	6.3	4.2
	Damaged	0	2.5	2.5	7.5	−0.5	4.4	4.4	13.9
	High damage	2.5	7.5	20	20	4.4	17.8	17.8	20
Mechanical conditions	Bad	0	0	0.35	0.5	0	0	0	0.06
	Medium	0.35	0.5	0.5	0.75	0	0.07	0.07	0.28
	Good	0.5	0.75	0.75	0.9	0.1	0.45	0.45	0.84
	Very good	0.75	0.9	1	1	0.31	0.9	0.9	1
Permeability	Low	0	0	0	70	0	90	90	280
	Medium	0	70	150	250	0	295	295	563
	High	100	250	10000	10000	284	9564	9564	12000
Viscosity	Low	0	0	40	100	0	121	121	312
	Medium	0	100	380	700	0	507	507	1000
	High	380	700	1000	1000	486	769	769	1000
Thickness	Low	0	0	5	10	0	0	0	9
	Medium	5	10	10	25	2	14	14	31
	High	10	25	25	35	12	26	26	40
	Very high	25	35	100	100	32	62	62	100