Display diagram vertically? about nomnoml HOT 2 CLOSED

nomnoml::nomnoml(" #direction: down
#.box: visual=ellipse fill=#8f8 bold fontsize=14
#.blob: visual=ellipse

  [<abstract>Zones]->[<database>Input data]
  [<abstract>Networks]->[Input data]
  [<abstract>OD]--:>[<box>Distribution]
  [<abstract>Scenarios]--:>[Input data]
  [Input data]->[<box>Trip generation]
  [Trip generation]->[<box>Distribution]
  [<box>Distribution]->[<box>Mode split]
  [Distribution]--:>[Trip generation] 
  [Mode split]->[<box>Assignment]
  [Mode split]--:>[Distribution]
  [Assignment]--:>[Mode split]
  [Assignment]--:>[<usecase>Evolution]")