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This page contains grayscale illustrations which can be used in class for instructional purposes. Two versions of each image are provided as a PDF files. The "Screen Version" displays at 72 dpi (dots per inch) and is a smaller file, which can be used for on-screen viewing. The 144 dpi image is a larger file, but should be used for downloading and printing since it will result in a higher quality image on paper or acetate. To view either one simply click on it. (On Windows, you may have to select "Open it" from a dialog box.) To download the "Print Version," drag the file to your desktop on Macintosh, or right-click and choose "Save Link as" on Windows. You will need Adobe Acrobat to view the transparencies. If Acrobat is not yet installed on your computer, you can download the Reader from the Adobe site now.
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