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Birefringence is dependent on (a) wavelength and (b) temperature for M5, M6, P1, and P3. (a) Measured at the same reduced temperature (T/Ti = 0.9) in each LC phase. (b) Plotted against temperature at 550 nm and fitted by Equations (3) and (4). For M6 and P3, the fitting was performed within the nematic phase.
