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Photoluminescence excitation spectra of SWNTs (normalized to tube concentrations measured by UV-Vis) suspended in (A) 1 and (B) mPEG(5000)-DSPE after removal of excess polymer. (C) Fluorescence emission spectra (λexc = 650 nm) of SWNTs in 1 (red) and mPEG(5000)-DSPE (black).