They aren't, actually. They're included in case somebody wishes to use them. You can use any size icon you want. Larger icons won't appear correctly in the admin drop down when you pick categories, but everything else is set by your CSS choices. I can't tell you what width would fill your table cells, however. The table is a fluid width, dependent on the width of your container, so I don't actually know what width it is for any given installation. You'll just need to experiment.
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