Correlation matrices derived from the transmittance cube. On the left panel, the correlation [ ρ (·, ·)] is performed between the fringes ( a i ) at different λ . The arrows highlight the high-correlation non-diagonal elements. The right panel shows the correlation of the fast Fourier transform (FFT) of fringes ( ã i ) with zero-frequency components removed. The arrow highlights the remnant non-diagonal elements with relatively high correlations.
