Fig. 6. Rietveld refinement of high-resolution synchrotron powder diffraction data for a powder sample of II (a), III (b), and IV (c). All samples contain 21 wt% Canada balsam. The data were collected at the ESRF at a wavelength of 0.41064(1) Å (a) and 0.39992(1) Å (b and c) and at room temperature (a) and 90 K (b and c). Observed intensities – black crosses, calculated intensities – red lines. Blue ticks are reflection positions. Magenta ticks in (a) mark reflection positions for I (the calculated fraction of I is 17.8 wt%). The lower traces show the difference curves.