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Experimental and fitted echo decay curves of the protons from PEO of 0.2 mg/mL F127 in the presence of 5 mM POPC/cholesterol liposome solution in D2O at 27 °C with (a) 1 mol %, (b) 2 mol %, (c) 5 mol %, (d) 10 mol %, (e) 20 mol %, and (f) 30 mol % cholesterol.