Fix bad histogramming bins in mri/eeg example. #26352
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The previous version of the histogram showed regular "spikes" which are entirely artefactual; they come from the fact that we were binning (effectively) integer data with floating point bins that did not all cover the same number of ints (even though they have the same floating point width). Using an explicit, integer binsize avoids this issue.
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new
(I also no longer normalize the histogram to 0-1 as I don't think this adds much, but I can restore that too if it is strongly preferred.)
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