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Regression Plot, Zone 1 Equivalent Thumbtip Reaches with Both Hands to the Ejection Seat Hand Grips, Hook Operated Controls in Both Cockpits of the T-37B. Data for both hands and both cockpits are combined. Because this control is attached to the seat and, therefore, its position relative to the pilot's shoulders does not change as the seat is adjusted, only one regression line is needed. Zone 1 Equivalent Thumbtip Reach (full-up seat) = Sitting Shoulder Height X 1.024 + 6.593, r = 0.91. N = >10.