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: 3 or 4 or 9 or 10 * Case 3: extent: 52% segments: 3 4 5 9 10 11 12 15 16 centroid: 10 or 11 ** Case 4: extent: 14% segments: 1 9 10 11 15 17 centroid: 15 * 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). ** For case 3, the centroid appears to be on the common border of segments 10 and 11. An entry reporting either of these two segments as the centroid would be scored as correct (CED = 0 for case 3).