**Figure 5**
Longest observed black/white edge length in the correlation map, *C*, against the frame number and dose (kGy) for pairwise comparisons with frame 1. For similar frames to frame 1, the pairwise CorMaps resemble randomized lattices (Figs. 4*a* and 4*b*) and hence *C* is fairly small. Therefore, the chance of observing a longer edge length than *C* is high [*P*(>*C*) = 1; blue circles]. As frames start becoming more dissimilar, the *C* values increase and the *P*(>*C*) values fall. These are represented by green squares. When frames are very dissimilar, *C* becomes very large (Figs. 4*c* and 4*d*) and *P*(>*C*) < 0.01. The symbols representing the comparison with these frames are orange triangles. |