Table 3.

p-Values of the regression coefficients in the obtained models.

Main Effects	Main Effects		Quadratic Effects		Interacted Effect
	X1	X2	X11	X22	X1 X2
λmax (nm) (p-value)	0.003	0.693	0.00	0.580	0.045
Concentration (ppm) (p-value)	0.018	0.153	0.224	0.247	0.030