Table 1

Comparison of coefficients of the quadratic polynomial models in the full dots set and the reduced dots set

Coefficients	Full dots selection		Reduced dots selection
Coefficients	Central zone	Annular zone	Central zone	Annular zone
A	0.0020	0.0002	0.0023	0.0002
B	0.0030	−0.0001	0.0031	−0.0001
C	0.0033	0.0002	0.0035	0.0001
D	−0.0740	−0.0061	−0.0682	−0.0055
E	0.0296	0.0091	0.0365	0.0117
Constant	107.96	114.22	107.33	114.88