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Table 2 Best-fit coefficients used in equation 1 for each facemask

From: Methods for evaluation of helium/oxygen delivery through non-rebreather facemasks

Coefficient
Mask A B C D
Hi-Ox 0.7391 0.8601 0.7233 −0.3210
Heliox21 0.8096 0.6169 0.7478 0.1950
Standard 0.8454 0.5460 0.8694 −0.1001