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@Oswald
Interesting thing is if you look on Reynolds web site they have the usual graph against competitors .. But also they have a link to a white paper, which has the same graph page 5, but with the HED 90 shown this time. Now, I'm no aero man and I didn't read the paper only looked at the pictures, but the HED doesn't look far off the Reynolds ..
http://www.reynoldscycling.com/downloads/DET%20White%20Paper%20Full%20Version-final.pdf