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Figure 10
The K-means cluster-counting algorithm evaluates the partition of N observations (voxelized ionization clusters in our case) in n clusters, so as to minimize the inertia I, defined as the sum of the squared distances of the observations to their closest cluster centre. In the plot: convergence of K-means for a beam rate of 1011 photons s−1. A Savitzky–Golay filter is applied for the purpose of smoothing the variation of the inertia δI.

Journal logoJOURNAL OF
SYNCHROTRON
RADIATION
ISSN: 1600-5775
Volume 28| Part 5| September 2021| Pages 1558-1572
https://doi.org/10.1107/S1600577521005919
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