I'm writing a document using markdown, which I'm exporting to a PDF using pandoc. At the end of the document I need to have space for signatures on a printed copy of the PDF. I've tried to find how to draw a line with a fixed width, but so far I only got to escaping the underscore character, which doesn't feel quite right. It's as if I'm missing something, this couldn't possibly be that unusual to want to do. Any help or pointers are greatly appreciated.