Last number i catch less good than US but RCS average for all sides is decent, very difficult to have these numbers in general only frontal.
Frontal 0.1 m2 in average for all sides 0.5 m2
Inferior and clearly for frontal RCS to F-22 0,0001, F-35 0,001 m2 but for the rest enough good more flattened, small drifts etc...
The rear with engines is medium as for J-20 engines not very well masked for IR signature don't want F-22 sure but two engines is better for IR hot air is more diluted.
In average F-22 : 0.3 m2 and i think F-35 to 0.4 m2
Ofc not exact numbers
But for combat in general ofc adversary look the front so the frontal RCS is the more important as for the armor of a tank.
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- are the reinforcements clearly visible on the wing. These huge structures (similar to the much smaller ones added to several F-16s) are to cope with structural issues.
