Table 2 Results of the modified Ångström turbidity equation fits for wavelengths of 350 nm to 1100 nm.

City	α	α*	β_sur	β_sur*	γ*	R² Eq. (2)	R² Eq. (3)	RMSE Eq. (2)	RMSE Eq. (3)
Chennai, India	0.560	2.093	0.078	0.008	−0.070	0.951	0.997	0.0037	0.0009
El Shorouk, Egypt	0.616	2.132	0.314	0.029	−0.252	0.945	0.998	0.0128	0.0027
El Shorouk, Egypt	0.621	2.073	0.315	0.032	−0.250	0.947	0.996	0.0127	0.0033
Golden (CO), USA	0.584	1.994	0.028	0.004	−0.025	0.916	0.950	0.0010	0.0007
Golden (CO), USA	0.636	1.718	0.020	0.004	−0.017	0.924	0.933	0.0008	0.0008
Jaén, Spain	0.841	2.604	0.041	0.005	−0.040	0.940	0.998	0.0038	0.0007
Penryn, UK	2.103	3.889	0.002	0.000	−0.002	0.948	0.984	0.0015	0.0008
Penryn, UK	2.092	2.988	0.001	0.001	−0.001	0.957	0.979	0.0011	0.0008
San José (CA), USA	1.219	2.098	0.013	0.005	−0.010	0.974	0.987	0.0015	0.0010
San José (CA), USA	1.447	1.904	0.008	0.004	−0.004	0.975	0.979	0.0011	0.0010
Tezpur, India	0.722	2.358	0.017	0.002	−0.016	0.937	0.983	0.0014	0.0007
Tezpur, India	0.712	2.415	0.019	0.002	−0.018	0.936	0.988	0.0015	0.0006

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