PhysioNet/Computers in Cardiology Challenge 2007 Reference Interpretations Updated 20 April 2007 Case 1: extent: 31% segments: 1 2 3 8 9 13 14 15 centroid: 8 Case 2: extent: 30% segments: 3 4 9 10 centroid: * * For Case 2, the centroid appears to be at the intersection of segments 3, 4, 9, and 10. An entry reporting any one of these four segments as the centroid would be scored as correct (CED = 0 for case 2).