lineThickness : Number

Sets the thickness of the custom break lines in pixels.

Default: 1
Example: 1,4,6 
var  chart =  new  CanvasJS.Chart("chartContainer",
{
 .
 .
 axisX: {
     scaleBreaks: {
	 customBreaks: [{
	     lineThickness: 6,
	     .
	     .
	 }]
     }
 },
 .
 . 
});
chart.render();
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