How do I make hollow symbols

There are two kinds of "hollow" symbols:

• Symbols that are truly hollow, and have no fill color ("none" is selected as the symbol fill color) whatsoever, and just the outline.

• Symbols that are actually filled with the color of the graph background (typically white).

There is a big difference between the way these symbols are drawn when symbols overlap or when a line is drawn through the symbols:

• Symbols without fills at all cannot have the line drawn "behind" the symbol even when this option is selected, as there is no fill color to obscure the line. The symbol outlines (edges) will still be drawn in front or behind the line.

• Symbols without fills will also display the edges of overlapping symbols

The following figures display the differences in appearance between true hollow symbols and symbols filled with white: