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OK, now I am confused about what is "upper" web and what is "lower." I was originally thinking "upper web" would be the leading edge of the feather (the skinny webbing) and "lower web" would be the trailing edge of the feather (the wider webbing on a primary, for example). Now I'm thinking "upper" is the outside of the feather when the wing is held against the body, or the top of the wing side if the bird were in flight - and "lower" is the underside of the wing. Clarification would be appreciated. Does "lower" = "underside"?
Sarah