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Temperature dependence of k/ko, the GBTGB helix wavevector k divided by its value ko at the CN/GBTGB transition in S1014/CE8 and W371. k/ko is approximately linear vs. T with similar slopes in the two materials, with deviation from linearity associated with the appearance of the intrablock SmC helix in the GBTGBC phase. Linear behavior indicates that η ≈ δGξ/Kko and thus δG varies as δG ≈ TN/TGBA - T.
