Figure 4

(a) Average modulated unit-cell \(a\sim 4.1\) Å, \(b\sim 7.1\) Å, \(c\sim 8.45\) Å, \(\alpha =\beta =\gamma =90^\circ \) and q = \(\frac{2}{3}\)a* + γc*, \(\gamma \sim \frac{1}{2}\). (b) Absolute difference (|Δγ|) between the measured γ and the commensurate value \(\frac{1}{2}\) for several PEDT data sets following the temperature. The errors displayed correspond to 3σ.