530 nm 580 nm 630 nm 530/580 rate 630/580 rate 530 nm 1.0 0.98 0.95 -0.53 0.78 580 nm 0.98 1.0 0.97 -0.66 0.79 630 nm 0.95 0.97 1.0 -0.63 0.91 530/580 ratio -0.53 -0.66 -0.63 1.0 -0.51 630/580 ratio 0.78 0.79 0.91 -0.51 1.0 *Spearman’s rank correlation coefficient

Table 3: Estimated Covariance Matrix of the Estimated Coefficients in Table 2.