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IMHO, Bob, you are right in the case, when the upper surface is painted, as in the photo of S.E. 5a you showed. However, if it is not, the effect may still be, that the ribs are partly visible and give the darker shade with even weak light coming from above the wing.
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Ash nazg durbatuluk, ash nazg gimbatul,
Ash nazg thrakatuluk, agh burzum-ishi krimpatul.
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