fillOpacity: Number

Sets opacity of filled area in Scale break.

Default: .9
Examples: .1, .5, 1. etc 
var  chart =  new  CanvasJS.Chart("chartContainer",
{
 .
 .
 axisX: {
    scaleBreaks: {
        fillOpacity: .2,
        .
        .
     },
    .
    .
 },
 .
 . 
});
chart.render();
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