Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Principal components in the Raman spectra. (A) Loadings for the first six principal components (PC1–PC6) of the Raman spectra are shown. PCA was performed based on all 243 single-spot Raman spectra. (B) Distribution of the contribution ratios of the PCA loadings; 16% of the overall spectral information was expressed in PC1–PC3. Inset is the log-log plot of the fractions of the first 100 components.
