> Why does the `NonMusicalPaperColumn` grob have a width of 0.5 units? Where it > is defined?
Are you referring to the blue arrow from the second-to-last non-musical column to the last rest? That's not a width, it's the minimum distance to the last rest's musical column. Also, why would non-musical columns have no width in general? Since they're containers, is it not logical for them to have the same width as the set of grobs they contain?
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