Opacity: Number
The Opacity property determines level of bubble chart bubble transparency.
Use JSON or the setOpacity method to set the property value and the getOpacity method to get the property value.
This property contains a numeric value between zero to one inclusive. The value 0 corresponds to a transparent bubble, the value 1 - to a non-transparent bubble.
The example of property use is given in the page ChartSerie Constructor.
See also: