Using fill opacity and stroke opacity properties
This article shows you how to use the Fill Opacity and Stroke Opacity properties to more easily customize the transparency of a chart series. These options are useful for setting up semi-transparent data points for bubble, scatter plot, area, and range charts.
2. Fill Opacity
Consider the following scatter plot chart.
This chart has overlapping data points but it is impossible to tell with the current settings.
To identify the overlapping points, go to Properties for the chart series. Click Look.
Then set the Fill Opacity property to 50%. This will make the data points semi-transparent and appear lighter. The data points that are overlapping are the ones that appear darker than the rest.
3. Stroke Opacity
Consider the following area chart. To make the series in front semi-transparent go to Properties for that series and click Look.
Then set the Fill Opacity and Stroke Opacity to 25%. The Stroke Opacity determines the opacity of the outline of the data points (areas).