Fig. 4.

(a) Example of image spectra from the same pixel of the same medium having smooth and rough surfaces. The dash lines represent second-order polynomial fits for I_s(x′, y′, k); comparison of estimated Σ_n from inhomogeneous media with lc_n of 20 and 100 nm, calculated from sample with smooth surfaces (b) or rough surfaces (c), without ( ${\displaystyle \sum }^{~}$) or with ( ${{\sum }^{\prime }}_n$) second-order polynomial fitting.