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Boxplots showing 1st percentile, 1st quartile, median, 3rd quartile and 99th percentile of the vertical, longitudinal and lateral electromagnetic transponders centroid positions registered during beam-on for each fractions of the seven patients. The red lines show the tolerance thresholds for beam gating. (For interpretation of the references to colour in this figure legend, the reader is referred to the web version of this article.)
