We generally do not recommend a complete grid as a background for the plot. Unless there are a large number of points, each data point is to be clearly shown on the graph. If more than one type of symbol is used, a legend should appear which clearly describes the meaning of each type of symbol. Lines drawn to indicate trends should not be drawn through the symbols for individual data points. Never draw figures free hand.
All figures are to be drawn using drawing instruments or prepared by a computer graphics program.
Avoid the use of different colors, because it will not be possible to reproduce colors in duplicated copies prepared on our copy machines.