Number illustrations (graphs, bar charts, line drawings, etc.) consecutively throughout the paper (with Arabic numerals) referring to them in the text as Fig. 1, Fig. 2, etc. with a caption at the top of each figure.
The minimum amount of descriptive text should be used on graphs and drawings (label curves, points, etc., with single letter symbols). Descriptive matter should be placed in the figure legend, which should accomplany each figure. Scale grids should not be used in graphs unless required for actual measurements. Graph axes should be labelled with variables written out in full along the length of the axes with the unit in parentheses ( e.g. Time (s) ). A table is usually more satisfactory for recording data.