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Contribution of individual spike trains to the overall reactivation strength. (a) Contribution of all the cells recorded during one session to the average of R 1 (or R 2), the reactivation strength of the first (or second) component, as a function of PC weights for the first (resp. the second) principal components p 1 (or p 2). (b) Scatter plot of the contributions to R 1 (x-axis) and R 2 shows that the sets of high-contribution cells for the two components are virtually disjoint
