Removing the outline from Pie chart slices

Normally, pie chart displays a small white outline around slices. You can change the outline color using outlineColor property.

However, if you don't want to show any outline at all, you can simply set outlineColor to an empty string:

var chart = AmCharts.makeChart("chartdiv", {
  "type": "pie",
  "outlineColor": "",
  // ...
});