O2 Mystery Cache

The cache is not at the posted coordinates. Take a course at the Center for Wilderness Safety, inhale as many effective oxygen molecules as possible and solve the puzzle below before beginning your expedition in the appropriately named park ;-)

18.6%       20.1%

15.4%       20.9%

17.3%       17.9% 

11.8%       12.3%

11.4%       20.9%

6.9%         8.4%

16.0%       9.4%

                 9.0%