Alpha Blending is supported by the following graphics:
Alpha Blending is especially important for pointplots with the problem of overlapping. With Alpha Blending all points are drawn transparently. Regions with a lot of overlapping points then appear more colourful than regions with almost no points.
Press ALT-LEFT/ALT-RIGHT to increase or decrease the alpha value of all visible points. The smaller the alpha value is, the more transparent are the points.