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Relationship between the water activity parameter of a phosphoglyceride species and its compressibility at 35 mN/m. Values of dπ/dA35, the slope of the π-A isotherm of a phosphoglyceride at 35mN/m, are plotted against the value of f1 for that species. The line shows a least-squares fit of the data taken from Tables 2–4.
