Shady areas denote 95% confidence interval (@lemouth and other physicists are cursing how sloppy we are).
Hehe! We use 95% confidence level for exclusions, not for claims for new phenomena were we ask for more ;)
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Fun fact: some of the standard blood test parameters could easily go into the negative if only 1σ is subtracted. Many parameters in biology/medicine are just incredibly different among the individuals.
Or... Some of us have anti-iron in the bloodstream.
lol... But at least, here, they say it is a 95% CL interval. This is not always the case when we discuss claims :)