Crown and ramified atoms in RouteViews (01 september 2001 tables) crown atoms take advantage of leaf and AS/leaf prefixes chop away non-branching "stalk" from the atom reduce to 72% atoms (Sept.01: from 24270 to 17566) ramified atoms different AS paths from the same-AS peers 0 4578 1 8636 2 2028 3 70 different path lengths in ramified atom 1 22142 2 5887 3 14 1 1