 <span class='kw'>x_zero</span> <span class='kw'>=</span> <span class='fl'>FALSE</span>,
  <span class='kw'>x_zero_line</span> <span class='kw'>=</span> <span class='kw'>NULL</span>,
  <span class='kw'>y_balance</span> <span class='kw'>=</span> <span class='fl'>FALSE</span>,
  <span class='kw'>y_expand</span> <span class='kw'>=</span> <span class='kw'>NULL</span>,
  <span class='kw'>y_labels</span> <span class='kw'>=</span> <span class='fu'>waiver</span>(),
  <span class='kw'>y_na</span> <span class='kw'>=<