The ulem package provides various types of underlining that can stretch
  between words and be broken across lines in LaTeX or plain TeX.
  In LaTeX ulem replaces italics with underlining in \em-phasized text.
  A declaration of \normalem (or the \usepackage option "normalem") restores 
  the normal \em and \emph behavior.

  Copyright 1989-2019 by Donald Arseneau (Vancouver, Canada; asnd@triumf.ca)

  This software may be freely transmitted, reproduced, or modified for any
  purpose provided that this copyright notice is left intact.