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Regression Plots, Zone 1 Equivalent Thumbtip Reaches with the Left Hand to the UHF Command Radio Control Panel Preset Switch, a Thumb Operated Control Examined in Both Cockpits of the T-38A. Data for the two cockpits have been combined. Zone 1 Equivalent Thumbtip Reach (full-up seat) = Sitting Shoulder Height X 0.450 + 28.727, r = 0.50. N = <10.