| The colour schemes were taken from the following sources:
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Visual Mining, Inc. "Charts--Color Palettes" 2003.
Available from http://chartworks.com/resources/palettes.html.
Internet; accessed 24 April 2003.
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Brewer, Cindy and Harrower, Mark. "ColorBrewer".
Available from http://www.personal.psu.edu/faculty/c/a/cab38/ColorBrewerBeta2.html.
Internet; accessed 24 April 2003.
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