Table 1.

Estimation of constants used in equation 1 based on the least square error method, along with goodness of fit parameters.

	a	b	c	d	SSE	R-square	Adjusted R-square	RMSE
Au	47	−0.00665	53.75	−0.00256	28.17	0.9939	0.9847	3.753
PEG	26.42	−0.01464	74.76	−0.004614	143.3	0.9763	0.9409	8.464
PDT	99.28	−0.004266	−1.8e-15	0.08659	34.55	0.9932	0.983	4.157
PDT + HET	28.41	−0.0701	71.59	−0.005605	19.4	0.9968	0.9919	3.114