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Colour contrasts (given as the absolute value of transmittance differences between the undoped and doped states) plotted versus wavelength for films of the investigated copolymers: (a) P3HT; (b) P3HT-Sil-PEG1; (c) P3HT-Sil-PEG2; (d) P3HT-Sil-PEG3; (e) P3HT-Sil.
