Hydrogen/Expired gas^2.25H post XXX challenge:VFr:Pt:Exhl gas:Qn
hydrogen/expired gas^2.25h post xxx challenge:vfr:pt:exhl gas:qn
Hydrogen/Expired gas 2.25 Hr post Unsp challenge (Exhl gas) [Volume fraction]
hydrogen/expired gas 2.25 hr post unsp challenge (exhl gas) [volume fraction]