Figures and other line illustrations may only be supplied in black and white and should be submitted in electronic format. Each figure should be numbered and titled. In the text, the position of figures should be indicated by typing on a separate line the words "Figure 1 about here". A copy of the data should also be included where appropriate.
Tables should be numbered consecutively and independently of any figures in the article and should be supplied in black and white. Each table should be numbered and titled. All columns should have explanatory headings. Tables should not repeat data that are available elsewhere in the paper. In the text, the position of tables should be indicated by typing on a separate line the words "Table 1 about here".
Internet screen dumps
Internet screen dumps should have a white background to increase the contrast between the illustration and the background and should be provided electronically as BITMAP, with a minimum acceptable resolution of 300 dpi. Their approximate final positions should be indicated in the margin of the text. Authors should be aware that graphics supplied with low resolution are not guaranteed to reproduce well and should be avoided whenever possible.