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Phil --
I think it's highly unlikely that the Plotter will be reworked to extend the step range but there are a few things you can do to make it work for your purposes. One possibility is to make a 21-step, 0-4.0 step tablet yourself. This is not an easy job but it's by no means impossible. Alternatively you can extend the range of a conventional 0.05-3.05 step tablet by sandwiching two of them so that steps 3.05 and 0.95 are superimposed. Finally, if you can find a commercial 0.05-4.x step tablet you can elect to use only 21 of the (27?) steps--for example, steps 1 through 8 (to define the toe contour) and 20 through 27 (for the shoulder), and alternate steps in between (where the curve contour is typically rather bland). There''s no law that says the steps have to progress in uniform increments. As long as you plot the densities that correspond with their step counterparts you'll get useful information.
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