Fig. 6

image

2D histogram of phase ratio vs. reflectance at angle α2 for each ROIat λ = 649.2 nm. The phase ratios were collected from images acquired at α1 ~ 0° and α2 ~ 5°. The corresponding reflectance was measured for the higher phase angle, α2. The color scale represents the number of data points within the bin, from high (yellow) to low (dark blue). The solid red line shows the 95% confidence ellipse.

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