Each comb «tooth» represents an individual color, or frequency, enabling very accurate measurements of the characteristic absorption signatures of different gas molecules of interest. (sciencedaily.com)
You would think it fairly easy to set up multiple containers with different gas concentrations and similar incident radiation. (dotearth.blogs.nytimes.com)
You can get a C - Class with several different gas and diesel engines, and with manual transmissions. (autoline.tv)