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Ligand escape yields from myoglobin as a function of viscosity (lower axis) or temperature (upper axis). ○, CO total escape yield; •, 
the absolute yield of CO escape via the Xe1 cavity. Δ, O2 total escape yield. □, fraction 
of CO escaped via Xe1. Lines are drawn to guide the eye. The solvent was Gly 79% w/w.
