Hydrogen/Expired gas^1.5H post XXX challenge:VFr:Pt:Exhl gas:Qn
hydrogen/expired gas^1.5h post xxx challenge:vfr:pt:exhl gas:qn
Hydrogen/Expired gas 1.5 Hr post Unsp challenge (Exhl gas) [Volume fraction]
hydrogen/expired gas 1.5 hr post unsp challenge (exhl gas) [volume fraction]