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Square of σDenzo as a function of the corresponding measured intensity I taken from the first frame of the multi-image experiment. The solid line corresponds to the parabolic fit (using equation 3) and the dotted line represents the fit line shown in Fig. 3 ▶ using the squared r.m.s.d. values as a function of the extrapolated intensity I 0. The minimum intensity used was 1500 ADUs.
