Table 6 Variance analysis after thermo-chemical treatment.

Origin	D.F	Adj. M.S	Adj. S.S	P. Value	F. Value
Regression	9	453.318	4079.86	0.002	18.71
Linear	3	299.649	898.95	0.009	12.37
K₁ (%)	1	312.716	312.72	0.016	12.90
K₂ (%)	1	639.374	639.37	0.004	26.38
K₃ (h)	1	2.095	2.09	0.781	0.09
Square	3	431.200	1293.60	0.004	17.79
K₁ * K₁ (%)	1	444.022	444.02	0.008	18.32
K₂ * K₂ (%)	1	795.552	795.55	0.002	32.83
K₃ * K₃ (h)	1	67.066	67.07	0.157	2.77
Interaction	3	18.059	54.18	0.570	0.75
K₁ * K₂	1	19.976	19.98	0.406	0.82
K₁ * K₃	1	19.180	19.18	0.414	0.79
K₂ * K₃	1	15.020	15.02	0.467	0.62
Error	5	24.234	121.17
Lack-of-fit	3	24.993	74.98		1.08
Pure Error	2	23.094	46.19
Total	14

Origin	D.F.	Adj. M.S.	Adj. S.S.	P value	F value
Regression	9	204.628	1841.65	0.043	5.13
Linear	3	166.375	499.12	0.079	4.17
K₁ (%)	1	135.216	135.22	0.125	3.39
K₂ (%)	1	61.422	61.42	0.270	1.54
K₃ (h)	1	220.122	220.12	0.066	5.52
Square	3	234.335	703.01	0.043	5.88
K₁ * K₁ (%)	1	398.091	398.09	0.025	9.99
K₂ * K₂ (%)	1	208.438	208.44	0.071	5.23
K₃ * K₃ (h)	1	84.692	84.69	0.205	2.12
Interaction	3	79.728	239.19	0.233	2.00
K₁ * K₂	1	0.369	0,37	0.927	0.01
K₁ * K₃	1	0.176	0.18	0.950	0.00
K₂ * K₃	1	238.641	238.64	0.058	5.99
Error	5	39.868	199.34
Lack-of-fit	3	61.167	183.50	0.117	7.72
Pure Error	2	7.919	15.84		5.13
Total	14

Origin	D.F.	Adj. M.S.	Adj. S.S.	P value	F value
Regression	9	0.506793	4.56114	0.002	19.59
Linear	3	0.50603	0.15181	0.239	1.96
K₁ (%)	1	0.068121	0.06812	0.166	2.63
K₂ (%)	1	0.010953	0.01095	0.544	0.42
K₃ (h)	1	0.055099	0.05510	0.204	2.13
Square	3	0.019187	0.05756	0.571	0.74
K₁ * K₁ (%)	1	0.001010	0.00101	0.851	0.04
K₂ * K₂ (%)	1	0.006119	0.00612	0.647	0.24
K₃ * K₃ (h)	1	0.050941	0.05094	0.220	1.97
Interaction	3	0.103560	0.31068	0.085	4.00
K₁ * K₂	1	0.280900	0.28090	0.022	10.86
K₁ * K₃	1	0.029756	0.02976	0.333	1.15
K₂ * K₃	1	0.000025	0.00002	0.976	0.00
Error	5	0.025875	0.12938
Lack-of-fit	3	0.005898	0.01769	0.949	0.11
Pure Error	2	0.055841	0.11168
Total	14

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