s='op'>+</span> <span class='id identifier rubyid_upper_edge_panel'>upper_edge_panel</span><span class='period'>.</span><span class='id identifier rubyid_width'>width</span>
  <span class='id identifier rubyid_lower_edge'>lower_edge</span><span class='period'>.</span><span class='id identifier rubyid_w'>w</span>         <span class='op'>=</span> <span class='ivar'>@w</span> <span class='op'>-</span> <span class='int'>2</span> <span class='op'>*</span> <span class='const'><span class='object_link'><a href="#