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Fluorescence spectra (415 nm excitation) of PpIX in PBS solution as a function of wavelength at lower (a) and higher (b) scattering coefficients. Emission intensities as a function of absorption coefficient at lower (c) and higher (d) scattering coefficients. Relative emission intensities at 630 nm of PpIX sample containing different concentrations of absorber compared with that containing no absorber is shown in right y-axis.
