>=</span> <span class='kw'>NULL</span>, <span class='kw'>y_zero</span> <span class='kw'>=</span> <span class='fl'>TRUE</span>, <span class='kw'>y_zero_line</span> <span class='kw'>=</span> <span class='fl'>FALSE</span>,
  <span class='kw'>y_trans</span> <span class='kw'>=</span> <span class='st'>"identity"</span>, <span class='kw'>y_labels</span> <span class='kw'>=</span> <span class='fu'>waiver</span>(), <span class='kw'>y_pretty_n</span> <span class='kw'>=</span> <span class='fl'>5</span>,
  <span class='