expand</th>
      <td><p>A vector of range expansion constants used to add padding to the x scale, as per the ggplot2 expand argument in ggplot2 scales functions.</p></td>
    </tr>
    <tr>
      <th>x_labels</th>
      <td><p>A function or vector to modify x scale labels, as per the ggplot2 labels argument in ggplot2 scales functions. If NULL, categorical variable labels are converted to sentence case. Use ggplot2::waiver() to keep x labels untransformed.</p></td>
    </tr>
    <tr>
      <th>x_na</th>
  