ariable, 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></td>
    </tr>
    <tr>
      <th>y_balance</th>
      <td><p>For a numeric y variable, add balance to the y scale so that zero is in the centre of the y scale.</p></td>
    </tr>
    <tr>
      <th>y_expand</th>
      <td><p>A vector of range expansion constants used to add padding to the y scale, as per the ggplot2 expand argum