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The valence and core level photoelectron spectra of gaseous indole, 2,3-dihydro-7-azaindole and 3-formylindole have been investigated using VUV and soft X-ray radiation, supported by both ab-initio electron propagator and density functional theory calculations. Three methods were used to calculate the outer valence band photoemission spectra outer valence green function, partial third order and renormalized partial third order. While all gave an acceptable description of the valence spectra, the last method yielded the very accurate agreement, espe