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 pretty algorithm. Defaults to 4.</p></dd>


<dt>y_expand</dt>
<dd><p>A vector of range expansion constants used to add padding to the y scale, as per the ggplot2 expand argument in ggplot2 scales functions.</p></dd>


<dt>y_labels</dt>
<dd><p>