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(A) Surface pressure versus area per amino acid residue of a KLAL film spread from an aqueous buffer solution. (B) IRRA spectra of the KLAL film during the compression at the respective areas per amino acid residues a–f of the surface pressure area curve in Fig. 3 A. The intensity of the spectra taken at positions e and f has been reduced by a factor of 2 for clarity. All spectra have been recorded at an angle of incidence of 40° and with p-polarized light.
