Figure 2.

Gaussian fits using (a) a single curve each for amide I and amide II bands and (b) nine curves, with amide I fits shown in orange and amide II fits in blue, respectively. (c) Normalized separation quality with DWA for different spectral subsets: blue showing single Gaussian case, purple showing multiple-Gaussian case and red showing the SDA case in the 1470–1710 cm⁻¹ region. The separation quality predicted by the SDA approach is so similar for both models that only one line is depicted. (d) Selection of discrete wavenumbers that yields the optimal separation quality using DWA.