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Sandy --
Select the "Family" tab to display the curve family. Then select the arrow pointer from the Plotter tool bar. That will cause the data points on all the curves to be marked with small circles. Touch any one of the circles to highlight it and you can then move up and down a single curve with the right and left arrow keys. Jump from curve to curve with the up/down arrow keys.
If you want to move a data point, highlight it, hold down the shift key, and use the up/down arrow keys to move the point. A floating window following the cursor will display the density values.
I don't know how the screen shots work in Mac OS 9.xx (if doesn't work). but if you're running OS X you can use to activate a special markee cursor that allows you to select any rectangular area of the screen (including VPC), which will then be saved as a PDF file. Open those files in Photoshop for editing. For editing that Photoshop doesn't do easily, copy the PS file to a draw or paint program.
Finally, check "Toe Twiddling for BTZS Users" in the Articles section of the btzs.org web page.
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