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- By CategoryMixed GasesGas Comp 3HELIUMGas Comp Amount299.9550000 35.0000000 99.8000000 99.9725000 99.9995000 83.0000000 66.0000000 99.9999500 99.8900000 99.7300000Gas Comp 2HYDROGEN CYCLOHEXENE AIR NITROGEN PPB FORMALDEHYDE PPM HYDROGEN SULFIDE