pan> <span class='kw'>=</span> <span class='kw'>NULL</span>,
  <span class='kw'>stroke_width</span> <span class='kw'>=</span> <span class='kw'>NULL</span>,
  <span class='kw'>frequency</span> <span class='kw'>=</span> <span class='fl'>1</span>,
  <span class='kw'>animation_speed</span> <span class='kw'>=</span> <span class='fl'>3</span>,
  <span class='kw'>trail_length</span> <span class='kw'>=</span> <span class='fl'>5</span>,
  <span class='kw'>tilt</span> <span class='kw'>=</span> <span class='kw'>NULL</