Table 3. The regression coefficients and probability (p-value) or corresponding response

	Total peak area (Y1)		D-Limonene (Y2)
	Coefficient	p-value	Coefficient	p-value
Intercept	1,154.55	<0.0001	633.7046	<0.0001
X1	–9.19	0.5381	–4.2584	0.5273
X2	157.35	<0.0001	91.4329	<0.0001
X3	–14.90	0.3389	–13.219	0.0922
X1X2	10.60	0.6126	16.3703	0.1238
X1X3	–23.00	0.2942	–9.939	0.3127
X2X3	35.17	0.1293	18.9825	0.0885
X12	–41.36	0.0952	–12.8638	0.2159
X22	–127.38	0.0017	–68.3523	0.0008
X32	51.36	0.0562	37.6797	0.0101
Model		0.0021		0.0006
R2	0.9248		0.9537