Wgraph:Demo arrow size

• Default size is 10
• Back_arrows have a default size of 0 and a style of none

{{#wgraph:svg|thumb=40|wgl|

 edge A K {}
 edge B L { arrow_size 20 }
 edge C M { arrow_size 0  }
 edge D N { back_arrow_size 20 }  // has no effect
 edge E O { back_arrow_size 20 back_arrow_style solid }
 yspace 250

}}