I've been using the listings package for a while, but have only recently noticed that the underscore is rendered with less width than the other characters. I'm working on some code snippets now which use a lot of variables containing an underscore, and so I see the effect more than ever. Is there any way to prevent this?


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in your preamble. The default underscore in OT1 encoding is indeed quite small.

If you don't want to switch font encoding, then the following code in the preamble will produce a similar underscore:

  \leavevmode\kern0.03em\vbox{\hrule\@width.6em \@height-.25ex \@depth0.37ex}\kern0.03em}

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