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Depends on the aircraft and time period. They generally weren't based on a ratio. If you specify a particular aircraft, I may be able to be more specific but here are some common ones:
FW190 Upper lower wing 910mm, fuselage 800/810mm
Bf 109G Upper wing 1000mm, lower wing 950, fuselage 950
Variations also existed within these. Source: Luftwaffe Colours 1935-1945 by Ullmann.