Click on the icon above. It may take a few minutes to load. The file is 14 megabytes, 32 pages and 40 figures. All files are prepared on a mac computer. The font style is Helvetica. Two of the figures have been rotated about 1 degree. This may be changed to the original setting in a PC and may require adjusting the labelling arrows. If there is a problem with the font or rotation, please let me know: aaronhorowitz@rocketmail.com .

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