ER"></a><i>&nbsp;&nbsp;VERTEX_VISIT_ORDER</i></td>

<td>Valid values are "I" (internal first), "B" (boundary first) and
  "U" (unordered), "N" (natural), "L" (largest degree first), "S"
  (smallest degree last). If "I" is selected, each processor colors
  its internal objects before boundary objects. If "B" is selected,
  each processor colors its boundary objects first. If "U" is
  selected, there is no such distinction between internal and boundary
  objects. "N" is equivalent to "U". If "L" is selected, 