Table 1.

Calculated statistical results including error variance and coefficient of determination and both angle positions obtained by fitting methods based on asymmetric, 24th-order polynomial and sigmoid-asymmetric equation for a full SPR curve. The SPR curve was experimentally obtained with water and air as bulk fluids on the sensing film, where N.A.: not available.

Bulk Fluid	Region	Fitting Method	Coefficient of Determination	Error Variance (×10−4)	Angle (°)
Water	Resonance angle	Asymmetric	0.999	0.268	66.6303
		24th order polynomial	0.999	0.020	66.6303
		Sigmoid-asymmetric	0.999	0.037	66.6189
	Critical angle	Asymmetric	0.536	1.189	N.A
		24th order polynomial	0.998	0.004	N.A
		Sigmoid-asymmetric	0.995	0.014	61.8309
Air	Resonance angle	Asymmetric	0.981	3.177	42.5929
		24th order polynomial	0.947	8.881	42.6955
		Sigmoid-asymmetric	0.997	0.499	42.6100
	Critical angle	Asymmetric	0.773	0.960	N.A
		24th order polynomial	0.412	2.488	N.A
		Sigmoid-asymmetric	0.985	0.065	41.3208