[R] [OT] getting a ~ character in LaTeX

[Douglas Bates]

I am writing course notes in LaTeX.  In the part where I am describing
model-fitting functions in R I want to use a ~ character inline.  If I
am displaying an example of R code in its own environment I use the
alltt environment, which protects the ~ character.  I have forgotten
how to protect the ~ when I am writing something like
  The operator `~' is used to define a model formula in \R.
  The left hand side is evaluated as the response.  The right hand
  side can consist of several \Emph{terms} with special meanings

I welcome suggestions.
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