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Regression Plots, Zone 1 Equivalent Thumbtip Reaches with the Right Hand to Actuate Starter #4, a Thumb Operated Control, from the Left Cockpit of the C-141A. Starter #4 is located on the overhead panel. Because this control is well above shoulder level, the slope of the regression lines is reversed. Zone 1 Equivalent Thumbtip Reach (full-up seat) = Sitting Shoulder Height X -0.467 + 36.538, r = -0.83. N = <10.