.</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 of 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_breaks_n</dt>
<dd><p>For a numeric y variable, the desired number of intervals on the y scale, as calculated by the pret