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Smoothed (calculated with a Savitzky-Golay filter using 21 points) average difference absorbance (logT-1) spectra in the spectral range of 1,300–1,600 nm (OH first overtone) of Milli-Q water and aqueous solutions of potassium-chloride in the concentration range of 10–100 mM. Average spectrum of Milli-Q water was subtracted from the spectra of potassium-chloride solutions.
