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@Howard
Looking at the diagram he's measuring the seat tube center to top, and the for the top-tube the virtual.
This isn't how cannondale measure their frames IIRC. Their 'measured size' is seat tube center to center; I'd bet the seat tube and top tube CC measures are 55cm.
Apparently the 7 is the same geo as the CAAD8, so even though they don't make a 55 anymore (phased out in 2004) you can get a good idea of the true size from the 54 and 56 measured sizes.