Figure 1
Britton plot (Britton, 1972; Fisher & Sweet, 1980) for a DAOCS crystal, showing the number of negative intensities as a function of the assumed twin fraction. An estimation of the twin fraction that is higher than its real value will result in several detwinned intensities with a negative value. The monitoring of the number of negative intensities as a function of the hypothetical α allows the actual twin fraction to be extrapolated (red line). |