fillOpacity: Number

Sets opacity of filled area in custom break.

Default: 0.9
Examples: .1, .5, 1. etc 
var  chart =  new  CanvasJS.Chart("container",
{
 .
 .
 axisX: {
    scaleBreaks: {
	customBreaks: [{
            fillOpacity: .2,
	    .
	    .
        }]
    }

 },
 .
 . 
});
chart.render();
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