Fig. 6.
Contour plot of photoacoustic spectra collected from a 5-mm deep tube while scanning along its length in 3-mm steps.
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.