Figure 3.

(a) Two-dimensional histogram showing changes in unit-cell dimension (a = b = c in space group P2₁3) and population across a chip as a function of absorbed dose. Populations are the numbers of indexed images in unit-cell bins of width 0.01 Å. The starting unit-cell dimensions of the polymorphs are 96.38 and 97.75 Å; these increase to 96.56 and 98.04 Å at 220 kGy. (b) Number of integrated images of each polymorph on the chip as a function of absorbed dose. Images were selectively integrated into ‘small’ or ‘large’ unit-cell groups (details are given in the text).