  <threshold map="hlines12x4" alias="hlines">
    <description>Horizontal Lines 12x4</description>
    <levels width="12" height="4" divisor="9">
      7 8 8 8 8 7 6 6 5 5 5 6
      2 1 1 1 1 2 3 4 4 4 3 3
      6 6 5 5 5 6 7 8 8 8 8 7
      3 4 4 4 3 3 2 1 1 1 1 2
    </levels>
  </threshold>
