Twelve images were taken over the course of an hour, each with a different filter to show the varying degrees of methane absorption in the layers of the planet's atmosphere. (discovermagazine.com)
«To confirm life is making oxygen or ozone, you need to expand your wavelength range to include methane absorption features. (sciencedaily.com)
The narrow Hcont filter is near the same wavelength, but samples only regions of weak methane absorption. (keckobservatory.org)