stemThickness : Number

Sets the thickness of Stem in Error / Box and Whisker Charts.

• Values should always be positive.
• Works only in Error / Box and Whisker Charts.

var  chart =  new  CanvasJS.Chart("container",
{
 .
 .
  data: [{
   type: "error",
   stemThickness: 4,
 
  },
 ]
 .
 . 
});
chart.render();