<p></p>
<p>Ubuntu regular is a variable width font, different characters have different widths.  Therefore its not possible to draw a continuous straight vertical line through a specific column since the position of that column depends on which characters exist in the lines.</p>
<p>The vertical line is drawn at the position as if all the lines contained all spaces.</p>
<p>When you use a "mono" font is its monospaced, ie all characters have the same width, so column 72 of a line of spaces is the same as a line of <code>a</code>s or <code>z</code>s or anything and it works.</p>

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