cters to wrap the x title to. Defaults to 50.</p></dd>


<dt>x_zero</dt>
<dd><p>For a numeric x variable, TRUE or FALSE of whether the minimum of the x scale is zero. Defaults to FALSE.</p></dd>


<dt>x_zero_line</dt>
<dd><p>For a numeric x variable, TRUE or FALSE whether to add a zero reference line to the x scale. Defaults to TRUE if there are positive and negative values in x_var. Otherwise defaults to FALSE.</p></dd>


<dt>y_expand</dt>
<dd><p>A vector of range expansion constants used to add padding to